Vitamins and Minerals: What You Actually Need

The supplement aisle suggests that good health is a matter of buying the right pills. The evidence suggests something far less profitable: that most people get what they need from food, that a few specific supplements genuinely matter, and that more is often worse, not better. Here is how to tell which is which. This is general information rather than medical advice; for your own needs, check with a clinician or trusted NHS guidance.

What vitamins and minerals are

Vitamins and minerals are micronutrients — substances your body needs in small amounts to function, but mostly cannot make itself. "Micro" is the key word: unlike carbohydrates, protein and fat, which you need in large quantities for energy and building blocks, micronutrients are needed in tiny amounts, yet they are essential.

The two groups differ in origin:

• Vitamins are organic compounds (made by living organisms — plants and animals). Examples include vitamin C, the B vitamins, and vitamins A, D, E and K.
• Minerals are inorganic elements that originate in soil and water and enter the food chain through plants and animals. Examples include calcium, iron, magnesium, potassium and zinc.

They act as the body's helpers — enabling energy release, immune function, bone strength, oxygen transport, nerve signalling and countless other processes. A shortfall in even one can cause specific problems.

What the key ones do

You do not need to memorise the whole list, but a sense of the major players is useful.

This is a sample, not a complete catalogue — but it illustrates the pattern: a varied diet covers a wide spread of nutrients without any one food doing all the work.

Food first

For the average healthy person, a varied and balanced diet supplies most vitamins and minerals. That is the consistent message from the NHS and nutrition bodies, and it is worth taking seriously before reaching for supplements.

The practical version is familiar:

• Plenty of vegetables and fruit, in a range of colours
• Wholegrains rather than refined where possible
• Some protein from a mix of sources — pulses, fish, lean meat, eggs, dairy or alternatives
• Healthy fats, including oily fish

Eating a diversity of whole foods is also what supports a healthy gut microbiome, so the same broad pattern pays off in more than one way. Food has a further advantage over pills: nutrients in food come packaged with fibre and other beneficial compounds, and the body often absorbs and regulates them better than isolated high doses.

The exceptions that matter

"Food first" does not mean "supplements never". There are well-defined cases where the NHS specifically advises supplementation.

Vitamin D

This is the big one. In the UK, sunlight is too weak from about October to March for skin to make enough vitamin D, so the NHS recommends that adults and children over one consider taking 10 micrograms of vitamin D a day in autumn and winter. People with little sun exposure, or with darker skin, may be advised to take it year-round.

Other defined groups

The NHS also recommends specific supplements for particular groups, including:

• Folic acid for those trying to conceive and in early pregnancy.
• Vitamin and mineral supplements for some young children.
• Iron, vitamin B12 or others where a deficiency has been identified — for example in some people following a vegan diet, or those with certain conditions.

The thread here is specificity: a clear reason, ideally identified or confirmed by a clinician, rather than a vague sense that more vitamins must be good.

More is not better

A crucial and often overlooked point: some vitamins and minerals are harmful in excess. This is easy to forget when supplements are sold as harmless wellness boosters.

• Fat-soluble vitamins (A, D, E, K) are stored in the body, so high doses can build up to harmful levels over time. Too much vitamin A, for instance, can be dangerous, including in pregnancy.
• Minerals like iron can cause real harm in overdose, which is one reason iron supplements should not be taken without reason.
• Mega-doses generally do not deliver mega-benefits. Beyond correcting a genuine deficiency, taking far more than you need rarely helps and can hurt.

The sensible rule is to stick to recommended amounts and avoid stacking multiple high-dose products, especially fat-soluble vitamins and minerals.

A sensible approach to supplements

Pulling it together:

• Build the foundation from food, with a varied, balanced diet.
• Take vitamin D in autumn and winter as the NHS advises, and year-round if you are in an at-risk group.
• Add other supplements only for a reason — pregnancy, a diagnosed deficiency, a restricted diet — ideally guided by a clinician.
• Respect upper limits and be wary of high-dose or "mega" formulas.
• Be sceptical of marketing, which routinely overstates what supplements can do — and remember that the basics, including limiting ultra-processed foods, matter more than any pill.

The bottom line

Vitamins and minerals are micronutrients your body needs in small amounts, and for most healthy people a varied, balanced diet supplies them. The main exception in the UK is vitamin D, which the NHS recommends most people take in autumn and winter, alongside specific supplements for certain groups. Remember that more is not better — several nutrients are harmful in excess — and check with a clinician before taking high doses or if you think you may have a deficiency.