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Vitamins, minerals and supplements Content Supplied by NHS Choices
Introduction

Vitamins and minerals are essential nutrients your body needs in small amounts to work properly.

Most people should get all the nutrients they need by eating a varied and balanced diet.

The pages in this section contain advice and information on vitamins, minerals and trace elements essential for health, including:

  • what they do
  • how much you need
  • what happens if you have too much
  • safety advice about supplements

For information about nutrition for children, see vitamins for children.

Vitamin and mineral supplements

If you choose to take vitamin and mineral supplements, be aware that taking too many or for too long can cause harmful effects.

Some people may need to take vitamin and mineral supplements. For information on who could benefit from supplements, see Do I need vitamin supplements

If you're trying to cut down on your salt intake, you might want to avoid vitamin and mineral supplements that come as effervescent or fizzy tablets, as they can contain up to 1g of salt per tablet.

Get more tips for a lower-salt diet.

What are vitamins

There are two types of vitamins: fat-soluble and water-soluble.

Fat-soluble vitamins

Fat-soluble vitamins are found mainly in fatty foods and animal products, such as vegetable oils, milk and dairy foods, eggs, liver, oily fish and butter.

While your body needs these vitamins every day to work properly, you don't need to eat foods containing them every day.

This is because your body stores these vitamins in your liver and fatty tissues for future use. These stores can build up so they are there when you need them. However, if you have much more than you need, fat-soluble vitamins can be harmful.

Fat-soluble vitamins are:

Water-soluble vitamins

Water-soluble vitamins are not stored in the body, so you need to have them more frequently.

If you have more than you need, your body gets rid of the extra vitamins when you urinate. As the body does not store water-soluble vitamins, these vitamins are generally not harmful. However, this doesn't mean that all large amounts are necessarily harmless.

Water-soluble vitamins are found in a wide range of foods, including fruit, vegetables, potatoes, grains, milk and dairy foods. Unlike fat-soluble vitamins, they can be destroyed by heat or being exposed to the air. They can also be lost in water used for cooking.

This means that by cooking foods, especially boiling them, we lose some of these vitamins. The best way to keep as many of the water-soluble vitamins as possible is to steam or grill foods, rather than boil them, or to use the cooking water in soups or stews rather than pouring it away.

Water-soluble vitamins are vitamin C, the B vitamins and folic acid.

There are also many other types of vitamins and minerals that are an important part of a healthy diet.

What are minerals

Minerals are necessary for three main reasons:

  • building strong bones and teeth
  • controlling body fluids inside and outside cells
  • turning the food you eat into energy

Minerals are found in foods such as meat, cereals (including cereal products such as bread), fish, milk and dairy foods, vegetables, fruit (especially dried fruit) and nuts.

Essential minerals include calcium and iron, although there are also many other types of minerals that are an important part of a healthy diet.

What are trace elements

Trace elements are also essential nutrients that your body needs to work properly, but in much smaller amounts than vitamins and minerals.

Trace elements are found in small amounts in a variety of foods such as meat, fish, cereals, milk and dairy foods, vegetables and nuts.

Examples of trace elements are iodine and fluoride.

Vitamin A

Vitamin A is also known as retinol and has several important functions.

These include:

  • helping your immune system to work as it should against infections
  • helping vision in dim light
  • keeping skin and the linings of some parts of the body, such as the nose, healthy

Good sources of vitamin A

Good sources of vitamin A include:

  • cheese
  • eggs
  • oily fish
  • fortified low-fat spreads
  • milk and yoghurt

Liver is a particularly rich source of vitamin A, although this means you may be at risk of having too much vitamin A if you eat liver more than once a week (see below).

You can also contribute to your vitamin A intake by including good sources of beta-carotene in your diet, as this can be converted into vitamin A by the body. The main food sources of beta-carotene are:

  • yellow, red and green (leafy) vegetables, such as spinach, carrots, sweet potatoes and red peppers
  • yellow fruit such as mango, papaya and apricots

How much vitamin A do I need

The amount of vitamin A adults need is:

  • 0.7mg a day for men
  • 0.6mg a day for women

You should be able to get all the vitamin A you need from your daily diet.

Any vitamin A your body doesn't need immediately is stored for future use. This means you don't need it every day.

What happens if I take too much vitamin A

According to some research, having more than an average of 1.5mg a day of vitamin A over many years may affect your bones, making them more likely to fracture when you are older.

This is particularly important for older people, especially women, who are already at risk of osteoporosis. This is where your bone density reduces and you have a higher risk of fractures.

If you eat liver or liver pâté more than once a week, you may be getting too much vitamin A.

Many multivitamins contain vitamin A. Other supplements, such as fish liver oil, are also high in vitamin A. If you take supplements containing vitamin A, make sure your daily intake of vitamin A from food and supplements does not exceed 1.5mg. If you eat liver every week, don't take supplements that contain vitamin A.

If you are pregnant

Having large amounts of vitamin A can harm your unborn baby. Therefore, if you are pregnant or thinking about having a baby, do not eat liver or liver products, such as pâté, because these are very high in vitamin A.

Also, do not take supplements that contain vitamin A. Ask your GP or midwife if you would like more information.

What does the Department of Health advise

You should be able to get all the vitamin A you need by eating a varied and balanced diet. If you take a supplement that contains vitamin A, don't take too much, because this could be harmful.

Liver is a very rich source of vitamin A. Do not eat liver or liver products, such as pâté, more than once a week. You should also be aware of how much vitamin A there is in any supplements you take.

If you are pregnant or thinking of having a baby:

  • do not take supplements containing vitamin A, including fish liver oil, unless advised to by your GP
  • do not eat liver or liver products, such as pâté, because these are very high in vitamin A

Women who have been through the menopause and older men, who are more at risk of osteoporosis, should avoid having more than 1.5mg of vitamin A a day from food and supplements. This means:

  • not eating liver or liver products, such as pâté, more than once a week, or having smaller portions of these
  • taking no more than 1.5mg of vitamin A a day in supplements (including fish liver oil) if you do not eat liver or liver products
  • not taking any supplements containing vitamin A (including fish liver oil) if you eat liver once a week

Having an average of 1.5mg a day or less of vitamin A from diet and supplements combined is unlikely to cause any harm.


The B vitamins

There are many different types of vitamin B and they all have important functions.

This section has information on:

Thiamin (vitamin B1)

Thiamin is also known as vitamin B1. It has several important functions, including:

  • working with other B-group vitamins to help break down and release energy from food
  • keeping the nervous system healthy

Good sources of thiamin

Thiamin is found in most types of food. Good sources include:

  • vegetables - such as peas
  • fresh and dried fruit
  • eggs
  • wholegrain breads
  • some fortified breakfast cereals
  • liver

How much thiamin do I need

The amount of thiamin you need is:

  • 1mg a day for men
  • 0.8mg a day for women

You should be able to get all the thiamin you need from your daily diet.

Thiamin cannot be stored in the body, so you need it in your diet every day.

What happens if I take too much thiamin

There is not enough evidence to know what the effects might be of taking high doses of thiamin supplements each day.

What does the Department of Health advise

You should be able to get all the thiamin you need by eating a varied and balanced diet. If you take supplements, do not take too much because this might be harmful.

Taking 100mg or less a day of thiamin supplements is unlikely to cause any harm.

Riboflavin (vitamin B2)

Riboflavin is also known as vitamin B2. Its functions include:

  • keeping skin, eyes and the nervous system healthy
  • helping the body release energy from the food we eat

Good sources of riboflavin

Good sources of riboflavin include:

  • milk
  • eggs
  • fortified breakfast cereals
  • rice

UV light can destroy riboflavin, so ideally these foods should be kept out of direct sunlight.

How much riboflavin do I need

The amount of riboflavin you need is about:

  • 1.3mg a day for men
  • 1.1mg a day for women

Riboflavin cannot be stored in the body, so you need it in your diet every day.

You should be able to get all the riboflavin you need from your daily diet.

What happens if I take too much riboflavin

There is not enough evidence to know what the effects might be of taking high doses of riboflavin supplements each day.

What does the Department of Health advise

You should be able to get all the riboflavin you need by eating a varied and balanced diet. If you take supplements, do not take too much, because this might be harmful.

Taking 40mg or less a day of riboflavin supplements is unlikely to cause any harm.

Niacin (vitamin B3)

Niacin is also known as vitamin B3. It has several important functions, including:

  • helping to release energy from the foods we eat
  • helping to keep the nervous systems and skin healthy

Good sources of niacin

There are two forms of niacin - nicotinic acid and nicotinamide - both of which are found in food.

Good sources of niacin include:

  • meat
  • fish
  • wheat flour
  • eggs
  • milk

How much niacin do I need

The amount of niacin you need is about:

  • 17mg a day for men
  • 13mg a day for women

You should be able to get all the niacin you need from your daily diet.

Niacin cannot be stored in the body, so you need it in your diet every day.

What happens if I take too much niacin

Taking high doses of nicotinic acid supplements can cause skin flushes. Taking high doses for a long time could lead to liver damage.

There is not enough evidence to know what the effects might be of taking high daily doses of nicotinamide supplements.

What does the Department of Health advise

You should be able to get the amount of niacin you need by eating a varied and balanced diet. If you take niacin supplements, do not take too much because this might be harmful.

Taking 17mg or less of nicotinic acid supplements a day or 500mg or less of nicotinamide supplements a day is unlikely to cause any harm.

Pantothenic acid

Pantothenic acid has several functions, such as helping to release energy from the food we eat.

Good sources of pantothenic acid

Pantothenic acid is found in virtually all meat and vegetable foods, including:

  • chicken
  • beef
  • potatoes
  • porridge
  • tomatoes
  • kidney
  • eggs
  • broccoli
  • wholegrains - such as brown rice and wholemeal bread

Breakfast cereals are also a good source if they have been fortified with pantothenic acid.

How much pantothenic acid do I need

You should be able to get all the pantothenic acid you need from your daily diet.

Pantothenic acid cannot be stored in the body, so you need it in your diet every day.

What happens if I take too much pantothenic acid

There is not enough evidence to know what the effects might be of taking high daily doses of pantothenic acid supplements.

What does the Department of Health advise

You should be able to get all the pantothenic acid you need by eating a varied and balanced diet. If you take supplements, do not take too much, as this might be harmful.

Taking 200mg or less a day of pantothenic acid in supplements is unlikely to cause any harm.

Vitamin B6

Vitamin B6 is also known as pyridoxine. It has several important functions, including:

  • allowing the body to use and store energy from protein and carbohydrates in food
  • helping to form haemoglobin - the substance in red blood cells that carries oxygen around the body

Good sources of vitamin B6

Vitamin B6 is found in a wide variety of foods, such as:

  • pork
  • poultry (such as chicken or turkey)
  • fish
  • bread
  • whole cereals - such as oatmeal, wheat germ and brown rice
  • eggs
  • vegetables
  • soya beans
  • peanuts
  • milk
  • potatoes
  • some fortified breakfast cereals

How much vitamin B6 do I need

The amount of vitamin B6 you need is about:

  • 1.4mg a day for men
  • 1.2mg a day for women

You should be able to get all the vitamin B6 you need from your daily diet.

What happens if I take too much vitamin B6

Taking more than 200mg a day of vitamin B6 for a long time can lead to a loss of feeling in the arms and legs, known as peripheral neuropathy.

Generally, the symptoms are reversible, so once you stop taking supplements, the symptoms usually stop.

However, in a few cases, when people have taken large amounts of vitamin B6, especially for more than a few months, the effect has been irreversible.

Taking doses of 10-200mg a day for short periods may not cause any harm. However, there is not enough evidence to say for how long these doses could be taken safely.

What does the Department of Health advise

You should be able to get the vitamin B6 you need by eating a varied and balanced diet. If you take vitamin B6 supplements, do not take too much, because this could be harmful.

Do not take more than 10mg of vitamin B6 a day in supplements, unless advised to by a doctor.

Biotin (vitamin B7)

Biotin is essential for the metabolism of fat. Very small amounts are needed.

The bacteria that live naturally in your bowel are able to make biotin, so it's not clear if you need any additional biotin from the diet.

Biotin is found naturally in a wide range of foods, but at very low levels compared with other water-soluble vitamins.

What happens if I take too much biotin

There is not enough evidence to know what the effects might be of taking high daily doses of biotin supplements.

What does the Department of Health advise

You should be able to get all the biotin you need by eating a varied and balanced diet. If you take biotin supplements, do not take too much, as this might be harmful.

Taking 0.9mg or less a day of biotin in supplements is unlikely to cause any harm.

Folic acid

Folic acid, known as folate in its natural form, is one of the B-group vitamins.

Folic acid has several important functions. For example, it:

  • works together with vitamin B12 to form healthy red blood cells
  • helps to reduce the risk of central nervous system defects, such as spina bifida, in unborn babies

A lack of folic acid could lead to folate deficiency anaemia.

Good sources of folic acid

Folate is found in small amounts in many foods. Good sources include:

  • broccoli
  • brussels sprouts
  • liver
  • spinach
  • asparagus
  • peas
  • chickpeas
  • fortified breakfast cereals

How much folic acid do I need

Adults need 0.2mg of folic acid a day.

Folic acid cannot be stored in the body, so you need it in your diet every day.

Most people should be able to get the amount they need by eating a varied and balanced diet.

However, if you are pregnant, thinking of trying to have a baby or likely to become pregnant, it is recommended that you take a 0.4mg (400 micrograms) folic acid supplement daily from the time you stop using contraception until the 12th week of pregnancy. This is to help prevent birth defects of the central nervous system, such as spina bifida, in your baby.

If you have a family history of conditions like spina bifida (known as neural tube defects), you may need to take a higher dose of 5mg of folic acid each day until the 12th week of pregnancy. This is available on prescription from your GP. Women with diabetes and those taking anti-epileptic medicines should speak to their GP for advice, as they may also need to take a higher dose of folic acid.

Read more about vitamins and minerals during pregnancy.

What happens if I take too much folic acid

Taking doses of folic acid higher than 1mg can disguise vitamin B12 deficiency.

An early symptom of vitamin B12 deficiency is anaemia. However, taking large amounts of folic acid treats the anaemia without treating the B12 deficiency. If a vitamin B12 deficiency is not noticed, it can eventually damage the nervous system.

This is particularly a concern for older people, because it becomes more difficult to absorb vitamin B12 as you get older.

What does the Department of Health advise

The Department of Health recommends that folic acid supplements are taken by women who are pregnant, thinking of having a baby or likely to become pregnant (see above).

Women who are not pregnant or planning for a baby should be able to get all the folate they need by eating a varied and balanced diet.

If you are taking folic acid supplements, it's important not to take too much, because this could be harmful.

Taking 1mg or less a day of folic acid supplements is unlikely to cause any harm.

Some women have an increased risk of having a pregnancy affected by a neural tube defect, and are advised to take a higher dose of 5mg of folic acid each day until they are 12 weeks pregnant. This is important and unlikely to cause harm, as it is taken on a short-term basis.

Vitamin B12

Vitamin B12 has several important functions and is involved in:

  • making red blood cells and keeping the nervous system healthy
  • releasing energy from the food we eat
  • processing folic acid

A lack of vitamin B12 could lead to vitamin B12 deficiency anaemia.

Good sources of vitamin B12

Good sources include:

  • meat
  • salmon
  • cod
  • milk
  • cheese
  • eggs
  • some fortified breakfast cereals

How much vitamin B12 do I need

Adults need approximately 0.0015mg a day of vitamin B12.

If you eat meat, fish or dairy foods, you should be able to get enough vitamin B12 from your diet.

However, because vitamin B12 is not found naturally in foods such as fruit, vegetables and grains, vegans may not get enough of this vitamin. Read our page on the vegan diet for information and advice on vegan nutrition.

What happens if I take too much vitamin B12

There is not enough evidence to show what the effects may be of taking high doses of vitamin B12 supplements each day.

What does the Department of Health advise

You should be able to get all the vitamin B12 you need by eating a varied and balanced diet. If you take vitamin B12 supplements, do not take too much, because this could be harmful.

Taking 2mg or less a day of vitamin B12 in supplements is unlikely to cause any harm.


Vitamin C

Vitamin C is also known as ascorbic acid and has several important functions.

For example, it:

  • helps to protect cells and keeps them healthy
  • is necessary for the maintenance of healthy connective tissue, which gives support and structure for other tissue and organs
  • helps wound healing

A lack of vitamin C can lead to scurvy.

Good sources of vitamin C

Vitamin C is found in a wide variety of fruit and vegetables. Good sources include:

  • oranges and orange juice
  • red and green peppers
  • strawberries
  • blackcurrants
  • broccoli
  • brussels sprouts
  • potatoes

How much vitamin C do I need

Adults need 40mg of vitamin C a day.

Vitamin C cannot be stored in the body, so you need it in your diet every day.

You should be able to get all the vitamin C you need from your daily diet.

What happens if I take too much vitamin C

Taking large amounts (more than 1,000mg per day) of vitamin C can cause:

These symptoms should disappear once you stop taking vitamin C supplements.

What does the Department of Health advise

You should be able to get all the vitamin C you need by eating a varied and balanced diet. If you take vitamin C supplements, do not take too much, because this could be harmful.

Taking less than 1,000mg of vitamin C supplements is unlikely to cause any harm.


Vitamin D

Vitamin D helps to regulate the amount of calcium and phosphate in the body.

These nutrients are needed to keep bones, teeth and muscles healthy.

A lack of vitamin D can lead to bone deformities such as rickets in children, and bone pain and tenderness as a result of a condition called osteomalacia in adults.

Good sources of vitamin D

From about late March/April to the end of September, most of us should be able to get all the vitamin D we need from sunlight on our skin. The vitamin is made by our body under the skin in reaction to sunlight.

If you are out in the sun, take care to cover up or protect your skin with sunscreen before you turn red or get burnt. Between October and early March we don't get any vitamin D from sunlight.

Read more about how we get vitamin D from sunlight.

Vitamin D is also found in a small number of foods. Good food sources are:

  • oily fish - such as salmon, sardines, herring and mackerel
  • red meat
  • liver
  • egg yolks
  • fortified foods such as most fat spreads and some breakfast cereals

Another source of vitamin D is dietary supplements.

In the UK, cows' milk is generally not a good source of vitamin D because it isn't fortified, as it is in some other countries.

How much vitamin D do I need

Babies from birth to one year need 8.5 to 10 micrograms (8.5-10mcg) of vitamin D a day.

Children from the age of one year and adults need 10 micrograms (10mcg) of vitamin D a day. This includes pregnant and breastfeeding women and population groups at risk of vitamin D deficiency (those with minimal exposure to sunshine and those from minority ethnic groups with dark skin).

From about late March/April to the end of September, most of us should be able to get all the vitamin D we need from sunlight on our skin.

Should I take a vitamin D supplement

Advice for infants and young children

The Department of Health recommends that:

  • Breastfed babies from birth to one year of age should be given a daily supplement containing 8.5 to 10mcg of vitamin D, to make sure they get enough.
  • Babies fed infant formula should not be given a vitamin D supplement until they are receiving less than 500ml (about a pint) of infant formula a day, because infant formula is fortified with vitamin D
  • Children aged 1 to 4 years old should be given a daily supplement containing 10mcg of vitamin D

You can buy single vitamin D supplements or vitamin drops containing vitamin D (for use by under-fives) at most pharmacies and supermarkets. Women and children who qualify for the Healthy Start scheme can get free supplements containing the recommended amounts of vitamin D.

See the Healthy Start website for more information on the scheme.

Advice for adults and children over five years old

Because vitamin D is found only in a small number of foods, it might be difficult to get enough from foods that naturally contain vitamin D and/or fortified foods alone. So everyone, including pregnant and breastfeeding women, should consider taking a daily supplement containing 10mcg of vitamin D.

Between late March/April to the end of September, the majority of people aged five years and above will probably obtain sufficient vitamin D from sunlight when they are outdoors. So you might choose not to take a vitamin D supplement during these months.

However, some groups of people will not get enough vitamin D from sunlight because they have very little or no sunshine exposure. So the Department of Health recommends that people should take a daily supplement containing 10mcg of vitamin D throughout the year if they:

  • are not often outdoors, such as those who are frail or housebound
  • are in an institution such as a care home
  • usually wear clothes that cover up most of their skin when outdoors

People from minority ethnic groups with dark skin, such as those of African, African-Caribbean or South Asian origin, might not get enough vitamin D from sunlight - so they should consider taking a daily supplement containing 10mcg of vitamin D throughout the year.

What happens if I take too much vitamin D

Taking too many vitamin D supplements over a long period of time can cause more calcium to be absorbed by the body than can be excreted. This leads to high levels of calcium in the blood (hypercalcaemia).

Too much calcium in the blood can weaken the bones and damage the kidneys and the heart.

If you choose to take vitamin D supplements, 10mcg a day will be enough for most people.

Do not take more than 100mcg of vitamin D a day, as it could be harmful. This applies to adults, including pregnant and breastfeeding women and the elderly, and children aged 11-17 years.

Children aged 1-10 years should not have more than 50mcg a day.

Infants under 12 months should not have more than 25mcg a day.

Some people have medical conditions that mean they may not be able to safely take as much. If in doubt, you should consult your doctor. If your doctor has recommended you take a different amount of vitamin D, you should follow their advice.

Your body doesn't make too much vitamin D from sun exposure, but always remember to cover up or protect your skin if you are out in the sun for long periods, to reduce the risk of skin damage and skin cancer.


Vitamin E

Vitamin E has several important functions. For example, it acts as an antioxidant, which protects cell membranes.

This helps to maintain healthy skin, eyes and strengthens the immune system.

Good sources of vitamin E

Vitamin E is found in a wide variety of foods. The richest sources are plant oils, such as soya, corn and olive oil.

Other good sources include:

  • nuts and seeds
  • wheat germ - found in cereals and cereal products

How much vitamin E do I need

The amount of vitamin E you need is:

  • 4mg a day for men
  • 3mg a day for women

You should be able to get all the vitamin E you need from your daily diet.

Any vitamin E your body doesn't need immediately is stored for future use, so you don't need it in your diet every day.

What happens if I take too much vitamin E

There isn't enough evidence to know what the effects might be of taking high doses of vitamin E supplements each day.

What does the Department of Health advise

You should be able to get the amount of vitamin E you need by eating a varied and balanced diet. If you take vitamin E supplements, don't take too much.

Taking 540mg or less a day of vitamin E supplements is unlikely to cause any harm.

Vitamin K

Vitamin K has several important functions. For example, it's needed for blood clotting, which means it helps wounds to heal properly.

There's some evidence that vitamin K is also needed to help keep bones healthy.

Good sources of vitamin K

Vitamin K is found in:

  • green leafy vegetables - such as broccoli and spinach
  • vegetable oils
  • cereal grains

Small amounts can also be found in meat and dairy foods.

How much vitamin K do I need

Adults need approximately 0.001mg a day of vitamin K for each kilogram of their body weight.

For example, someone who weighs 65kg would need 0.065mg a day of vitamin K, while a person who weighs 75kg would need 0.075mg a day.

You should be able to get all the vitamin K you need by eating a varied and balanced diet.

Any vitamin K your body doesn't need immediately is stored in the liver for future use, so you don't need it in your diet every day.

What happens if I take too much vitamin K

There's not enough evidence to know what the effects might be of taking high doses of vitamin K supplements each day.

What does the Department of Health advise

You should be able to get all the vitamin K you need by eating a varied and balanced diet. If you take vitamin K supplements, don't take too much, because this might be harmful.

Taking 1mg or less of vitamin K supplements a day is unlikely to cause any harm.


Calcium

There is more calcium in the body than any other mineral, and it has several important functions.

These include:

  • helping to build strong bones and teeth
  • regulating muscle contractions, including heartbeat
  • ensuring that blood clots normally

A lack of calcium could lead to a condition called rickets in children or osteoporosis in later life.

Good sources of calcium

Good sources of calcium include:

  • milk, cheese and other dairy foods
  • green leafy vegetables - such as broccoli, cabbage and okra, but not spinach
  • soya beans
  • tofu
  • soya drinks with added calcium
  • nuts
  • bread and anything made with fortified flour
  • fish where you eat the bones - such as sardines and pilchards

How much calcium do I need

Adults need 700mg of calcium a day.

You should be able to get all the calcium you need from your daily diet.

What happens if I take too much calcium

Taking high doses of calcium (over 1,500mg a day) could lead to stomach pain and diarrhoea.

What does the Department of Health advise

You should be able to get all the calcium you need by eating a varied and balanced diet.

If you take calcium supplements, don't take too much. Taking 1,500mg or less a day is unlikely to cause any harm.

Iodine

Iodine helps to make the thyroid hormones. These hormones help to keep cells and the metabolic rate healthy.

Good sources of iodine

Iodine is a trace element found in seawater, rocks and some types of soil. Good food sources include sea fish and shellfish.

Iodine can also be found in plant foods, such as cereals and grains, but the levels vary, depending on the amount of iodine in the soil where the plants are grown.

How much iodine do I need

Adults need 0.14mg of iodine a day.

Most people should be able to get all the iodine they need by eating a varied and balanced diet.

What happens if I take too much iodine

Taking high doses of iodine for long periods of time could change the way your thyroid gland works. This can lead to a wide range of different symptoms, such as weight gain.

What does the Department of Health advise

You should be able to get all the iodine you need by eating a varied and balanced diet. If you take iodine supplements, don't take too much, because this could be harmful.

Taking 0.5mg or less a day of iodine supplements is unlikely to cause any harm.


Iron

Iron is an essential mineral, with several important roles in the body.

For example, it helps to make red blood cells, which carry oxygen around the body.

A lack of iron can lead to iron deficiency anaemia.

Good sources of iron

Good sources of iron include:

  • liver
  • meat
  • beans
  • nuts
  • dried fruit - such as dried apricots
  • wholegrains - such as brown rice
  • fortified breakfast cereals
  • soybean flour
  • most dark-green leafy vegetables - such as watercress and curly kale

Although liver is a good source of iron, don't eat it if you are pregnant. This is because it is also rich in vitamin A which, in large amounts, can harm your unborn baby.

How much iron do I need

The amount of iron you need is:

  • 8.7mg a day for men
  • 14.8mg a day for women

You should be able to get all the iron you need from your daily diet.

Women who lose a lot of blood during their monthly period (heavy periods) are at higher risk of iron deficiency anaemia and may need to take iron supplements. Speak to your GP or a registered dietitian for more advice.

What happens if I take too much iron

The side effects of taking high doses (over 20mg) of iron include:

Very high doses of iron can be fatal, particularly if taken by children, so always keep iron supplements out of the reach of children.

What does the Department of Health advise

Most people should be able to get all the iron they need by eating a varied and balanced diet. If you take iron supplements, don't take too much, because this could be harmful.

Taking 17mg or less a day of iron supplements is unlikely to cause any harm. However, continue taking a higher dose if advised to by your GP.


Other vitamins and minerals

As well as vitamins and more common minerals - such as calcium, iodine and iron - a healthy diet includes many other substances.

This section has information on:

Beta-carotene

Beta-carotene gives yellow and orange fruit and vegetables their colour. It's turned into vitamin A in the body, so it can perform the same functions in the body as vitamin A.

Good sources of beta-carotene

The main food sources of beta-carotene are:

  • yellow and green (leafy) vegetables - such as spinach, carrots and red peppers
  • yellow fruit - such as mango, melon and apricots

How much beta-carotene do I need

You should be able to get the amount of beta-carotene you need from your daily diet.

What happens if I take too much beta-carotene

Beta-carotene supplements have been found to increase the risk of lung cancer developing in smokers and in people who have been heavily exposed to asbestos at work.

It's possible that taking large amounts of beta-carotene supplements could also increase the risk of cancer in other people.

Some research suggests that having large amounts of vitamin A over a long period may affect people's bones and make them more likely to fracture when they are older. However, beta-carotene does not have this effect. This is because the body's conversion of beta-carotene into vitamin A is not very efficient, so it's unlikely to result in high levels of vitamin A in the body.

What does the Department of Health advise

You should be able to get the amount of beta-carotene you need by eating a varied and balanced diet. If you decide to take beta-carotene supplements, it's important not to take too much, because this could be harmful.

Don't take more than 7mg of beta-carotene supplements a day, unless advised to by a doctor.

People who smoke or who have been exposed to asbestos are advised not to take any beta-carotene supplements.

There is no evidence that the beta-carotene we get from food is harmful.

Boron

Boron is a trace element, which means the body only needs very small amounts of it. Boron is thought to help the body make use of glucose, fats, oestrogen and other minerals, such as calcium, copper and magnesium, in the food we eat.

Good sources of boron

Boron is found widely in the environment, in the oceans, rocks, soils and plants. Food sources of boron include:

  • green vegetables
  • fruit
  • nuts

How much boron do I need

You should be able to get all the boron you need from your daily diet.

What happens if I take too much boron

Taking high doses of boron supplements for long periods may reduce fertility in men.

What does the Department of Health advise

You should be able to get all the boron you need by eating a varied and balanced diet. If you take supplements containing boron, don't take too much, as this could be harmful.

Taking 6mg or less of boron supplements a day is unlikely to cause any harm.

Chromium

Chromium is a trace element thought to influence how the hormone insulin behaves in the body. This means chromium may affect the amount of energy we get from food.

Good sources of chromium

Chromium is found widely in the environment, in air, water and soil, and in plants and animals.

Good food sources of chromium include:

  • meat
  • wholegrains - such as wholemeal bread and whole oats
  • lentils
  • broccoli
  • potatoes
  • spices

How much chromium do I need

Adults need at least 0.025mg of chromium a day.

You should be able to get all the chromium you need by eating a varied and balanced diet.

What happens if I take too much chromium

There is not enough evidence to know what the effects might be of taking high doses of chromium each day.

What does the Department of Health advise

You should be able to get all the chromium you need by eating a varied and balanced diet.

If you take chromium supplements, don't take too much, because this might be harmful.

Having 10mg or less a day of chromium from food and supplements is unlikely to cause any harm.

Cobalt

Cobalt is a trace element that forms part of the structure of vitamin B12 - one of the B vitamins.

Good sources of cobalt

Cobalt is found widely in the environment. Good food sources of cobalt include:

  • fish
  • nuts
  • green leafy vegetables - such as broccoli and spinach
  • cereals - such as oats

How much cobalt do I need

You should be able to get all the cobalt you need from your daily diet.

Cobalt is a major part of the structure of vitamin B12. Therefore, if you get enough vitamin B12, you will also get enough cobalt.

Adults need approximately 0.0015mg of vitamin B12 a day.

What happens if I take too much cobalt

Having high amounts of cobalt for long periods of time could affect the heart and might decrease fertility in men.

What does the Department of Health advise

Having too much cobalt could be harmful. However, cobalt is currently not used in supplements in the UK and the amount we get from food is not harmful.

Having 1.4mg or less a day of cobalt supplements is unlikely to cause any harm.

Copper

Copper is a trace element that has several important functions. For example, it:

  • helps to produce red and white blood cells, and triggers the release of iron to form haemoglobin - the substance that carries oxygen around the body
  • is thought to be important for infant growth, brain development, the immune system and strong bones

Good sources of copper

Good sources of copper include:

  • nuts
  • shellfish
  • offal

How much copper do I need

Adults need 1.2mg of copper a day.

You should be able to get all the copper you need from your daily diet.

What happens if I take too much copper

Taking high doses of copper could cause:

  • stomach pain
  • sickness
  • diarrhoea
  • damage to liver and kidneys, if taken for a long time

What does the Department of Health advise

You should be able to get all the copper you need by eating a varied and balanced diet. If you take copper supplements, don't take too much, because this could be harmful.

Having 1mg or less a day of copper supplements is unlikely to cause any harm.

Magnesium

Magnesium is a mineral that, among other things:

  • helps turn the food we eat into energy
  • helps to make sure the parathyroid glands, which produce hormones that are important for bone health, work normally

Good sources of magnesium

Magnesium is found in a wide variety of foods, such as:

  • green leafy vegetables - such as spinach
  • nuts
  • brown rice
  • bread (especially wholegrain)
  • fish
  • meat
  • dairy foods

How much magnesium do I need

The amount of magnesium you need is:

  • 300mg a day for men
  • 270mg a day for women

You should be able to get all the magnesium you need from your daily diet.

What happens if I take too much magnesium

Taking high doses of magnesium (more than 400mg) for a short time can cause diarrhoea.

There is not enough evidence to say what the effects might be of taking high doses of magnesium for a long time.

What does the Department of Health advise

You should be able to get all the magnesium you need by eating a varied and balanced diet. If you take magnesium supplements, don't take too much, because this could be harmful.

Having 400mg or less a day of magnesium from supplements is unlikely to cause any harm.

Manganese

Manganese is a trace element that helps make and activate some of the enzymes in the body.

Good sources of manganese

Manganese is found in a variety of foods, including:

  • tea - which is probably the biggest source of manganese for many people
  • bread
  • nuts
  • cereals
  • green vegetables - such as peas and runner beans

How much manganese do I need

You should be able to get all the manganese you need from your daily diet.

What happens if I take too much manganese

Taking high doses of manganese for long periods of time might cause muscle pain, nerve damage and neurological symptoms, such as fatigue and depression.

What does the Department of Health advise

You should be able to get all the manganese you need by eating a varied and balanced diet. If you take manganese supplements, don't take too much, as this could be harmful.

For most people, taking 4mg or less of manganese supplements a day is unlikely to cause any harm.

For older people, taking 0.5mg or less of manganese supplements a day is unlikely to cause any harm. This is a lower amount because older people may be more sensitive to manganese.

Molybdenum

Molybdenum is a trace element that helps make and activate some of the enzymes involved in repairing and making genetic material.

Good sources of molybdenum

Molybdenum is found in a wide variety of foods. Foods that grow above ground tend to be higher in molybdenum than foods that grow below the ground, such as potatoes or carrots.

Good sources of molybdenum include:

  • nuts
  • tinned vegetables
  • cereals - such as oats
  • peas
  • leafy vegetables - including broccoli and spinach
  • cauliflower

How much molybdenum do I need

You should be able to get all the molybdenum you need from your daily diet.

What happens if I take too much molybdenum

There is some evidence to suggest taking molybdenum supplements might cause joint pain.

What does the Department of Health advise

You should be able to get all the molybdenum you need by eating a varied and balanced diet. The molybdenum we get from food is not likely to be harmful.

Nickel

Nickel is a trace element that:

  • influences the amount of iron our bodies absorb from foods
  • may be important in helping to make red blood cells

Good sources of nickel

Nickel is found widely in the environment. Good food sources include:

  • nuts
  • lentils
  • oats

How much do I need

You should be able to get all the nickel you need from your daily diet.

What happens if I take too much nickel

Up to 10% of people in the UK may have an allergy to nickel that causes a skin rash.

This is usually caused by jewellery or coins that contain nickel, but nickel in food or supplements can also cause a rash if you have this allergy.

What does the Department of Health advise

You should be able to get all the nickel you need by eating a varied and balanced diet.

If you are allergic to nickel or think you might be, avoid taking nickel supplements.

The nickel found naturally in food should not cause any harm.

Phosphorus

Phosphorus is a mineral that helps to build strong bones and teeth, and helps to release energy from food.

Good sources of phosphorus

Phosphorus is present in many foods. Good sources include:

  • red meat
  • dairy foods
  • fish
  • poultry
  • bread
  • brown rice
  • oats

How much phosphorus do I need

Adults need 550mg of phosphorus a day.

You should be able to get all the phosphorus you need from your daily diet.

What happens if I take too much phosphorus

Taking high doses of phosphorus supplements for a short time can cause diarrhoea or stomach pain.

Taking high doses for a long time can reduce the amount of calcium in the body, which means that bones are more likely to fracture.

What does the Department of Health advise

You should be able to get all the phosphorus you need by eating a varied and balanced diet. If you take phosphorus supplements, it's important not to take too much, because this could be harmful.

Taking 250mg or less a day of phosphorus supplements is unlikely to cause any harm.

Potassium

Potassium is a mineral that has many important functions, including:

  • controlling the balance of fluids in the body
  • correct functioning of the heart muscle

Good sources of potassium

Potassium is found in most types of food. Good sources of potassium include:

  • fruit - such as bananas
  • some vegetables - such as broccoli, parsnips and brussel sprouts
  • pulses
  • nuts and seeds
  • fish
  • shellfish
  • beef
  • chicken
  • turkey

How much potassium do I need

Adults need 3,500mg of potassium a day. You should be able to get all the potassium you need from your daily diet.

What happens if I take too much potassium

Taking too much potassium can cause stomach pain, nausea and diarrhoea.

What does the Department of Health advise

You should be able to get all the potassium you need by eating a varied and balanced diet. If you take potassium supplements, don't take too much, because this could be harmful.

Taking 3,700mg or less of potassium supplements a day is unlikely to have obvious harmful effects.

However, older people may be more at risk of harm from potassium. This is because as we get older, our kidneys may become less able to remove potassium from our blood. Therefore, older people should not take potassium supplements unless advised to by a doctor.

Selenium

Selenium is a trace element that plays an important role in our immune system's function and in reproduction. It also helps to prevent damage to cells and tissues.

Good sources of selenium

Selenium is found widely in the environment. Good food sources include:

  • brazil nuts
  • fish
  • meat
  • eggs

How much do I need

The amount of selenium you need is:

  • 0.075mg a day for men
  • 0.06mg a day for women

If you eat meat, fish or nuts, you should be able to get all the selenium you need from your daily diet.

What happens if I take too much selenium

Too much selenium causes selenosis - a condition that, in its mildest form, can lead to loss of hair, skin and nails.

What does the Department of Health advise

You should be able to get all the selenium you need by eating a varied and balanced diet including meat, fish or nuts. If you take selenium supplements, it's important not to take too much, because this could be harmful.

Taking 0.35mg or less a day of selenium supplements is unlikely to cause any harm.

Silicon

Silicon is a mineral that helps keep bones and connective tissues healthy.

Good sources of silicon

Silicon is found in high levels in grains such as oats, barley and rice. It's also found in fruit and vegetables.

How much silicon do I need

You should be able to get all the silicon you need from your daily diet.

What happens if I take too much silicon

There is not enough evidence to know what the effects might be of taking high doses of silicon supplements each day.

What does the Department of Health advise

You should be able to get all the silicon you need by eating a varied and balanced diet. If you take silicon supplements, it is important not to take too much, because this might be harmful.

Taking 700mg or less of silicon supplements a day is unlikely to cause any harm.

Sodium chloride (salt)

Sodium chloride is commonly known as salt. Sodium and chloride are minerals that are needed by the body in small amounts to help keep the level of fluids in the body balanced.

Chloride helps the body to digest food because it's an essential component of the fluids in the stomach and intestines.

Sources of salt

Salt is found naturally at low levels in all foods, but some salt is added to many processed foods, such as:

  • ready meals
  • meat products - such as bacon
  • some breakfast cereals
  • cheese
  • some tinned vegetables
  • some bread
  • savoury snacks

How much salt do I need

You should have no more than 6g of salt (2.4g of sodium) a day. However, on average, people in the UK eat 8.1g of salt (about 3.2g of sodium) a day, which is much more than the body needs.

A few practical tips for cutting down on salt include:

  • check food labels and choose foods with less salt
  • choose tinned vegetables and pulses with no added salt
  • only use sauces - like soy sauce, brown sauce, ketchup and mayonnaise - sparingly, because these are often high in salt
  • eat fewer salty snacks, such as crisps, salted nuts and salty foods such as bacon, cheese, pickles and smoked fish
  • add less or no salt when cooking - use herbs and spices for flavour instead
  • choose low-salt stock cubes, or make your own stock without added salt
  • taste your food first and do not automatically add extra salt

Read more facts about salt, cutting down on salt and how much salt is good for me

What happens if I have too much salt

Having too much salt is linked to an increase in blood pressure (hypertension), which raises your risk of a stroke and heart attack.

What does the Department of Health advise

On average, we eat 2.1g more salt than we should each day.

The Department of Health advises people to cut down on salt and that sodium chloride should not be used in supplements.

Sulphur

Sulphur is a mineral involved in many different processes. For example, it helps to make tissues, such as cartilage.

Sources of sulphur

Sulphur is found naturally in many different forms in all foods. It's also used in the form of sulphates and sulphites as food additives in some processed foods.

How much sulphur do I need

You can get all the sulphur you need from your daily diet.

What does the Department of Health advise

You can get all the sulphur you need by eating a varied and balanced diet.

Zinc

Zinc is a trace element that has several important functions. For example, it:

  • helps to make new cells and enzymes
  • helps us process carbohydrate, fat and protein in food
  • helps with the healing of wounds

Good sources of zinc

Zinc is found widely in the environment. Good food sources of zinc include:

  • meat
  • shellfish
  • dairy foods - such as cheese
  • bread
  • cereal products - such as wheat germ

How much zinc do I need

The amount of zinc you need is about:

  • 5.5-9.5mg a day for men
  • 4.0-7.0mg a day for women

You should be able to get all the zinc you need from your daily diet.

What happens if I take too much zinc

Taking high doses of zinc reduces the amount of copper the body can absorb. This can lead to anaemia and weakening of the bones.

What does the Department of Health advise

You should be able to get all the zinc you need by eating a varied and balanced diet. If you take zinc supplements, it's important not to take too much, because this could be harmful.

Don't take more than 25mg of zinc supplements a day, unless advised to by a doctor.

 
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