“Multivitamins improve the health of most healthy people.”
Moderate confidence because evidence reviews find little or no benefit for preventing cardiovascular disease, cancer or death in generally healthy adults, and a large cohort found no mortality benefit. Randomized COSMOS substudies suggest a small cognitive benefit in older adults, so “no benefit” would also be too broad.
A daily multivitamin has not been shown to prevent major chronic disease or extend life for most well-nourished adults. It may fill a specific intake gap, and trials suggest a small cognitive benefit in some older adults.
A multivitamin is a bundle of doses, not one treatment, and formulas differ. Evidence in generally healthy adults does not apply to pregnancy, diagnosed deficiency, malabsorption, restrictive diets or other conditions with a specific nutrient indication.
Safety note: More is not better. Preformed vitamin A can harm a fetus, excess iron can be dangerous when not needed, vitamin K can interfere with warfarin, and combining fortified foods with several supplements can exceed upper limits.
Talk to a healthcare professional if: Review the label with a clinician or pharmacist if you are pregnant or planning pregnancy, take warfarin, have kidney or liver disease, have iron overload, or use several supplements or fortified products.
A multivitamin can be practical for a defined gap, but it is not proven general health insurance and cannot replace a varied diet or evidence-based care.
Identify the nutrient or reason you are trying to address. If you use a multivitamin, choose doses near daily values and avoid overlapping high-dose products.
Similar claims on Multivitamins
A daily multivitamin won't hurt, but for someone eating reasonably it mostly buys peace of mind, not health. Spend the effort on the diet itself.