Multivitamins: Who Actually Needs One

HEALTH · GLOBAL

Multivitamins: Who Actually Needs One

Where the evidence sits, absorption claims, reading a label and specific groups

Multivitamins are the most bought supplement and the one with the weakest general case, which does not mean nobody benefits from one.

The general evidence

Large trials in well-nourished populations have generally not found that a daily multivitamin reduces heart disease, cancer or mortality. That is the honest headline, and it is about averages rather than individuals.

A supplement corrects a shortfall. Where there is no shortfall, there is nothing to correct.

Who does benefit

Anyone pregnant or planning a pregnancy needs folic acid, and vitamin D is recommended through autumn and winter in northern latitudes. Vegans need B12, and iodine, iron, omega-3 and calcium warrant attention.

Older adults, people with absorption conditions, anyone after bariatric surgery, and people on restricted diets all have a real case.

Absorption claims

Liposomal, methylated and food-state formats are marketed on superior absorption. Some forms genuinely are absorbed better — methylfolate and methylcobalamin, for instance — and for most nutrients in most people, the standard forms are absorbed adequately.

Higher absorption of something you already have enough of achieves nothing.

Reading a label

Check the amount per serving against the reference intake, how many capsules make a serving, and which chemical form each nutrient is in. Very high percentages are not better.

Avoid stacking products, since taking a multivitamin alongside individual supplements can push vitamin A, iron or zinc above safe levels.

Interactions

High-dose biotin interferes with several common blood tests. Vitamin K affects warfarin. Tell your doctor and pharmacist everything you take.

Cost

Work out the cost per day and compare it against the food that would provide the same nutrients. For most people a multivitamin is a small ongoing cost for a small or absent benefit.

Money spent on vegetables, oily fish and pulses does more.

Quality

Look for third-party testing, a manufacturing address and a batch number. Avoid products making claims about treating a named medical condition, which supplements may not legally do in most countries.

Stacking supplements

Taking a multivitamin alongside individual products is how people end up above safe limits for vitamin A, iron, zinc and selenium. Add up the totals across everything, including fortified cereals and drinks.

Fat-soluble vitamins A, D, E and K accumulate in the body, which is why excess matters more with those than with water-soluble ones.

When to test

Ask a doctor for a blood test rather than guessing at a deficiency, since symptoms overlap enormously and treating the wrong thing wastes months.

Food first

A varied diet covers almost everything, and whole foods deliver nutrients in combinations supplements do not reproduce.

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