Supplements / Evidence
Do You Need a Vitamin Supplement?
For most people, a multivitamin is an expensive reassurance. For a few specific situations, supplementation is officially recommended. The difference is worth knowing.
For most people, a multivitamin is an expensive reassurance. For a few specific situations, supplementation is officially recommended. The difference is worth knowing.
The default answer is no
Public health guidance across the UK and internationally is consistent: most people eating a varied diet do not need a general multivitamin. Nutrients are better obtained from food, and the routine multivitamin has repeatedly failed to demonstrate meaningful benefit in healthy populations.
That is an unpopular thing to say in a category worth billions, which is roughly why it needs saying.
“The official recommendations are short, specific and free of enthusiasm. That is precisely what makes them worth reading.”
Where supplementation is actually recommended
Vitamin D is the clearest case. UK guidance advises everyone to consider a daily supplement of 10 micrograms during autumn and winter, because sunlight is insufficient at northern latitudes for most of the year. Some groups are advised to take it year round.
Folic acid before and during early pregnancy is a firm recommendation with strong evidence behind it, and it is time sensitive.
Vitamin B12 is required for anyone eating a vegan diet, and is commonly relevant for older adults and people on certain medications where absorption is reduced.
Iron is recommended where deficiency has been identified, and specifically not as a precaution, because iron supplementation without deficiency carries its own risks.
The part the marketing skips
More is not better. Several vitamins are stored rather than excreted, and high doses of vitamin A, vitamin D and others carry real risks. Upper safe limits exist for good reasons.
Supplements can also interact with prescribed medication. This is not a fringe concern; it is routine enough that it should be mentioned to a pharmacist rather than guessed at.
And a supplement is regulated as a food product, not a medicine. That governs safety, not efficacy. A product on a shelf has not been shown to do what the packaging implies.
What we are not claiming
We are not claiming supplements are useless. Several are officially recommended and one of them, folic acid, prevents serious harm. We are not claiming anyone should stop something a clinician has advised.
We are claiming that the default should be a specific reason, tested against guidance, rather than a general sense that it must be helping. That is a different way of shopping and it is usually a cheaper one.
Reviewed for accuracy by WT Research Desk