Introduction

Vitamins and minerals
Vitamins and minerals

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

Most people should get all the nutrients they need by having a varied and balanced diet, although some few people may need to take extra supplements.

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Vitamin A

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

These include:

  • helping your body's natural defence against illness and infection (the immune system) work properly
  • 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 and liver products such as liver pate - this is a particularly rich source of vitamin A, so you may be at risk of having too much vitamin A if you have it more than once a week (this is particularly important if you're pregnant).

You can also get vitamin A by including good sources of beta-carotene in your diet, as the body can change this 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 (19-64 years) 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 diet.

Any vitamin A that your body does not need immediately is stored for future use. This means you do not 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, a condition that weakens bones.

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 from food and supplements does not exceed 1.5mg. If you eat liver every week, do not 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, do not 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 you are 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.

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B vitamins and folic acid

There are many different types of vitamin B.

This section has information on:

Thiamin (vitamin B1)

Thiamin, also known as vitamin B1, helps:

  • break down and release energy from food
  • keep the nervous system healthy

Good sources of thiamin

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

  • peas
  • fresh and dried fruit
  • eggs
  • wholegrain breads
  • some fortified breakfast cereals
  • liver

How much thiamin do I need?

The amount of thiamin adults (19-65 years) 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, also known as vitamin B2, helps:

  • keep skin, eyes and the nervous system healthy
  • the body release energy from the food

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 adults (19-64 years) 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, also known as vitamin B3, helps:

  • release energy from the foods we eat
  • 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:

  • 16.5mg a day for men
  • 13.2mg 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 food.

Good sources of pantothenic acid

Pantothenic acid is found in almost all meat and vegetable, 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, as it's found in many foods.

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, also known as pyridoxine, helps:

  • allow the body to use and store energy from protein and carbohydrates in food
  • 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 adults (19-64 years) 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.

This will usually improve once you stop taking the supplements. However, in a few cases, when people have taken large amounts of vitamin B6, especially for more than a few months, the effect can be permanent.

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 needed in very small amounts to help the body break down fat.

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 also found in a wide range of foods, but only at very low levels.

What happens if I take too much biotin?

There's 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, don't 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, helps:

  • the body form healthy red blood cells
  • reduce the risk of central neural tube 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 (but avoid this during pregnancy)
  • spinach
  • asparagus
  • peas
  • chickpeas
  • fortified breakfast cereals

How much folic acid do I need?

Adults need 200mcg 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 400mcg of folic acid supplement daily from the time you stop using contraception until the 12th week of pregnancy. This is to help prevent birth defects, 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. Therefore speak to your GP if this is relevant to you.

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, which can eventually damage the nervous system if it's not spotted and treated.

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.

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, but speak to your doctor first.

Vitamin B12

Vitamin B12 is involved in:

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

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

Good sources include:

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

How much vitamin B12 do I need?

Adults (19-64 years) need about 1.5mcg 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.

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.

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Vitamin C

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

These include:

  • helping to protect cells and keeps them healthy
  • maintaining healthy skin, blood vessels, bones and cartilage
  • helping with wound healing

Lack of vitamin C can lead to scurvy. Mild deficiencies may occur in infants given unsupplemented cows' milk and in people with poor or very restricted diets.

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 (19-64 years) need 40mg of vitamin C a day.

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

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

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.

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Vitamin D

Vitamin D helps 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 caused by a condition called osteomalacia in adults.

Good sources of vitamin D

From about late March/early April to the end of September, most people should be able to get all the vitamin D they need from sunlight. The body creates vitamin D from direct sunlight on the skin when outdoors.

But between October and early March we don't get enough vitamin D from sunlight. Read more about vitamin D and sunlight.

Vitamin D is also found in a small number of foods.

. Good food sources are:

  • oily fish – such as salmon, sardines, herring, mackerel and fresh tuna
  • 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 up to the age of one year need 8.5-10mcg of vitamin D a day.

Children from the age of one year and adults need 10mcg of vitamin D a day. This includes pregnant and breastfeeding women, and people at risk of vitamin D deficiency.

From about late March/early April to the end of September, the majority of people should be able to get all the vitamin D they need from sunlight on their 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 8.5-10mcg of vitamin D to make sure they get enough
  • formula-fed babies shouldn't be given a vitamin D supplement until they're having less than 500ml (about a pint) of infant formula a day, as infant formula is fortified with vitamin D
  • children aged 1-4 years old should be given a daily supplement containing 10mcg of vitamin D

You can buy vitamin D supplements or vitamin drops containing vitamin D (for 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.

Advice for adults and children over five years old

During the autumn and winter, you need to get vitamin D from your diet because the sun isn't strong enough for the body to make vitamin D.

But since it's difficult for people to get enough vitamin D from food alone, everyone (including pregnant and breastfeeding women) should consider taking a daily supplement containing 10mcg of vitamin D during the autumn and winter.

Between late March/early April to the end of September, most people can get all the vitamin D they need through sunlight on their skin and from a balanced diet. You may choose not to take a vitamin D supplement during these months.

People at risk of vitamin D deficiency

Some people won't get enough vitamin D from sunlight because they have very little or no sunshine exposure.

The Department of Health recommends that you take a daily supplement containing 10mcg of vitamin D throughout the year if you:

  • aren't often outdoors – for example, if you're frail or housebound
  • are in an institution like a care home
  • usually wear clothes that cover up most of your skin when outdoors

If you're from a minority ethnic group with dark skin, such as African, African-Caribbean or south Asian, you may also not get enough vitamin D from sunlight. You 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 too much calcium to build up in the body (hypercalcaemia). This 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.

Don't 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 shouldn't have more than 50mcg a day. Infants under 12 months shouldn't 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're out in the sun for long periods to reduce the risk of skin damage and skin cancer.

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Vitamin E

Vitamin E helps maintain healthy skin and eyes, and strengthen the body's natural defence against illness and infection (the immune system).

Good sources of vitamin E

Vitamin E is found in a wide variety of foods.

Good sources include:

  • plant oils – such as soya, corn and olive oil
  • nuts and seeds
  • wheatgerm – 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.

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Vitamin K

Vitamin K is needed for blood clotting, which means it helps wounds heal properly.

There's also some evidence vitamin K may 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 1mcg a day of vitamin K for each kilogram of their body weight.

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

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Calcium

Calcium 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 and osteomalacia or osteoporosis in later life.

Sources of calcium

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 (19-64 years) 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 as this could be harmful. Taking 1,500mg or less a day is unlikely to cause any harm.

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Iodine

Iodine helps make thyroid hormones, which help keep cells and the metabolic rate – the speed at which chemical reactions take place in the body – healthy.

Good sources of iodine

Good food sources of iodine include:

  • sea fish
  • 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.

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Iron

Iron is important in making 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 (but avoid during pregnancy)
  • 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

How much iron do I need?

The amount of iron you need is:

  • 8.7mg a day for men (19-64 years)
  • 14.8mg a day for women (19-50 years)
  • 8.7mg a day for women (50-64 years)

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.

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, do not 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.

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Other

As well as vitamins and more common minerals, a healthy diet includes many other nutrients.

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?

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

But beta-carotene supplements have been found to increase the risk of lung cancer in people who smoke or have been heavily exposed to asbestos at work.

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

Some research suggests having large amounts of vitamin A over a long period may affect people's bones and make them more likely to fracture when they're older. Beta-carotene doesn't have this effect.

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 as 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.

Chromium

Chromium is 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

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?

Around 25mcg of chromium a day should be enough for adults.

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 as this might be harmful.

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

Cobalt

Cobalt makes up part of vitamin B12.

Good sources of cobalt

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 vitamin B12. So if you get enough vitamin B12, you'll also get enough cobalt.

Adults need approximately 1.5mcg 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. But cobalt isn't currently used in supplements in the UK, and the amount we get from food isn't harmful.

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

Copper

Copper helps:

  • produce red and white blood cells
  • trigger the release of iron to form haemoglobin, the substance that carries oxygen around the body

It's also 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 (19-64 years) 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 (19-64 years)
  • 270mg a day for women (19-64 years)

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 helps make and activate some of the enzymes in the body. Enzymes are proteins that help the body carry out chemical reactions, such as breaking down food.

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, who may be more sensitive to manganese, taking 0.5mg or less of manganese supplements a day is unlikely to cause any harm.

Molybdenum

Molybdenum helps make and activate some of the proteins involved in chemical reactions (enzymes) that help with 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's 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.

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 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 as this could be harmful.

Taking 250mg or less a day of phosphorus supplements on top of the phosphorous you get from your diet is unlikely to cause any harm.

Potassium

Potassium is a mineral that helps control the balance of fluids in the body, and also helps the heart muscle work properly.

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 (19-64 years) 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 as this could be harmful.

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

But older people may be more at risk of harm from potassium because their kidneys may be less able to remove potassium from the blood. Older people shouldn't take potassium supplements unless advised to by a doctor.

Selenium

Selenium helps the immune system work properly, as well as in reproduction. It also helps prevent damage to cells and tissues.

Good sources of selenium

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 (19-64 years)
  • 0.06mg a day for women (19-64 years)

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 that includes meat, fish or nuts. If you take selenium supplements, it's important not to take too much as this could be harmful.

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

Sodium chloride (salt)

Sodium chloride is commonly known as salt.

Sodium and chloride are minerals needed by the body in small amounts to help keep the level of fluids in the body balanced. Chloride also helps the body digest food.

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.

But, on average, people in the UK eat 8g 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 – where colour-coded labels are used, try to pick products with more greens and ambers, and fewer reds, for a healthier choice
  • choose tinned vegetables and pulses with no added salt
  • choose tinned fish in spring water rather than brine
  • only use sauces – like soy sauce, brown sauce, ketchup and mayonnaise – sparingly, as 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 don't automatically add extra salt 

Read the British Dietetic Association leaflet on Salt for facts about salt, including cutting down on salt and how much salt is good for you.

What happens if I have too much salt?

Having too much salt is linked to high blood pressure, which raises your risk of serious problems like strokes and heart attacks.

What does the Department of Health advise?

Adults should eat no more than 6g of salt a day – that's around one teaspoon. On average, we eat 2.1g more salt than we should each day.

The Department of Health advises that people cut down on salt and says sodium chloride shouldn't be used in supplements.

Zinc

Zinc helps with:

  • making new cells and enzymes
  • processing carbohydrate, fat and protein in food
  • wound healing

Good sources of zinc

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:

  • 9.5mg a day for men (19-64 years)
  • 7mg 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, don't take too much as 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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The information on this page has been adapted by NHS Wales from original content supplied by NHS Choices.
Last Updated: 16/06/2017 14:48:19