Are Multivitamins a Waste of Money?
For a healthy adult eating a varied diet, a daily multivitamin is unlikely to prevent disease or meaningfully extend life. The USPSTF conclusion is correct in that context. But "not beneficial for primary disease prevention in healthy adults" is a far more specific claim than "waste of money for everyone." If you're in a higher-risk group for specific deficiencies, targeted supplementation — or a high-quality multivitamin — remains sensible. If you're not, spending the same money on vegetables is probably the better investment.
Sensitive populations: This article references pregnancy. Always confirm any supplement change with your obstetrician or midwife before starting — dosing, contraindications, and risk profile shift in these groups.
The U.S. multivitamin market generates billions of dollars a year, and according to the U.S. Preventive Services Task Force (USPSTF), about 31% of U.S. adults report taking a multivitamin-mineral supplement. In 2022 the USPSTF published its updated review, and the headline most people heard was that multivitamins are a waste of money. The actual conclusion was narrower and more careful than that — and the question "are multivitamins a waste of money?" turns out to depend entirely on who is asking.
What the USPSTF Actually Said
The 2022 USPSTF statement concluded, with moderate certainty, that the harms of beta-carotene outweigh any benefit for preventing cardiovascular disease or cancer, and that there is no net benefit from vitamin E for those outcomes — a formal recommendation against both (a "D" recommendation). For multivitamins specifically, however, the Task Force issued an "I statement": the evidence is insufficient to determine whether the benefits outweigh the harms for preventing cardiovascular disease or cancer.1 "Insufficient evidence" is not the same as "proven useless," and the conclusion applies to one narrow question — primary disease prevention in community-dwelling, non-pregnant adults. It says nothing about people with documented deficiencies, malabsorption disorders, restrictive diets, or medication-driven nutrient depletion.
Does a daily MVI move the outcomes that matter?
What the Trials Actually Found
The largest randomized data come from two big U.S. trials. In the Physicians' Health Study II, 14,641 male physicians took a standard daily multivitamin or placebo for a median of 11.2 years. Total cancer was modestly but significantly reduced (hazard ratio 0.92; 95% CI 0.86–0.998), an 8% relative reduction; there was no significant effect on prostate cancer, colorectal cancer, or cardiovascular events, and the mortality reduction was not statistically significant.2 That is a real but small signal — and notably it has not been replicated for cancer in women or younger populations.
The more recent evidence is on cognition. The COSMOS-Mind trial randomized 2,262 older adults to a daily multivitamin-mineral or placebo and found a statistically significant benefit on global cognition over three years (the effect was roughly equivalent to slowing cognitive aging by about two years), with larger benefit in participants who had cardiovascular disease.3 A 2024 meta-analysis pooling three COSMOS cognitive sub-studies (more than 5,000 participants) confirmed small but consistent benefits on global cognition and episodic memory.4 These are promising findings, but the effect sizes are modest, the cocoa-extract arm of the same trial showed nothing, and independent replication outside the COSMOS program is still pending. None of this contradicts the USPSTF: a small cognitive benefit in older adults is a different claim from preventing heart attacks and cancer in the general adult population.
For the disease-prevention question the megadose-antioxidant trials are also relevant, because they explain why a multivitamin is not automatically beneficial. The 2007 Bjelakovic meta-analysis of 68 antioxidant-supplement trials (232,606 participants) found no mortality benefit and, in the low-bias trials, increased mortality from beta-carotene, vitamin A, and vitamin E.5 More is not better, and a multivitamin loaded with high-dose fat-soluble vitamins is not a free lunch.
Who Actually Benefits
For several groups, a multivitamin (or, better, targeted supplementation) is a sensible low-cost insurance policy. Older adults frequently have inadequate intake or absorption of vitamin B12, vitamin D, and zinc. Strict vegetarians and vegans are at elevated risk for B12, iron, zinc, and iodine insufficiency. Long-term metformin therapy depletes B12. Bariatric-surgery patients malabsorb multiple micronutrients and need lifelong supplementation. And people who are pregnant or planning pregnancy benefit from folate, iron, and iodine above usual dietary levels — here the evidence (especially folate for neural-tube-defect prevention) is strong rather than "insufficient." For these populations the question is not whether to supplement, but what.
The Problem With Most Multivitamin Products
Even when supplementation is warranted, product quality varies widely. Many multivitamins use cheap, poorly absorbed mineral forms (magnesium oxide, zinc oxide) at doses too low to correct a real deficiency, while packing in fat-soluble vitamins that can accumulate. The iron and calcium in a single combined pill compete for absorption. Products that use better-absorbed forms — methylcobalamin for B12, methylfolate for folate, cholecalciferol (D3) for vitamin D — tend to cost more. The honest bottom line: for a healthy adult eating a varied diet, a daily multivitamin is unlikely to prevent disease or extend life, and the money is usually better spent on vegetables; for higher-risk groups, a well-chosen multivitamin or targeted supplement is genuinely worthwhile.
Sources
- US Preventive Services Task Force; Mangione CM, Barry MJ, Nicholson WK, et al. "Vitamin, Mineral, and Multivitamin Supplementation to Prevent Cardiovascular Disease and Cancer: US Preventive Services Task Force Recommendation Statement." JAMA, 2022;327(23):2326-2333. PMID 35727271.
- Gaziano JM, Sesso HD, Christen WG, et al. "Multivitamins in the prevention of cancer in men: the Physicians' Health Study II randomized controlled trial." JAMA, 2012;308(18):1871-80. PMID 23162860.
- Baker LD, Manson JE, Rapp SR, et al. "Effects of cocoa extract and a multivitamin on cognitive function: A randomized clinical trial (COSMOS-Mind)." Alzheimers Dement, 2023;19(4):1308-1319. PMID 36102337.
- Vyas CM, Manson JE, Sesso HD, et al. "Effect of multivitamin-mineral supplementation versus placebo on cognitive function: results from the COSMOS clinic subcohort and meta-analysis of 3 cognitive studies within COSMOS." Am J Clin Nutr, 2024;119(3):692-701. PMID 38244989.
- Bjelakovic G, Nikolova D, Gluud LL, Simonetti RG, Gluud C. "Mortality in randomized trials of antioxidant supplements for primary and secondary prevention: systematic review and meta-analysis." JAMA, 2007;297(8):842-57. PMID 17327526.