A Multivitamin Ran an 11-Year Trial and Prevented Zero Heart Attacks — the Megadose Kind Can Even Harm
In the largest randomized trial, a daily multivitamin did not reduce major cardiovascular events over 11 years — it matched placebo exactly. For healthy eaters the pill is gap-insurance at best, and high-dose versions of some vitamins raise mortality. But a real nutrient gap is a different story.
Multivitamin bottles — Thorne, Ritual and Pure Encapsulations — on a dark stone surface at dusk
The single most-taken supplement on earth got the single cleanest test, and it failed it. In the Physicians' Health Study II — a randomized, double-blind, placebo-controlled trial of 14,641 male physicians followed for a median of 11.2 years — a common daily multivitamin “did not reduce major cardiovascular events, MI, stroke, [or] CVD mortality” versus placebo (Sesso 2012). The event rates were almost identical: 11.0 per 1,000 person-years on the multivitamin, 10.8 on placebo. That is not a small benefit. That is no benefit.
This isn't “supplements are a scam.” It's more specific and more useful than that: for a well-fed adult with no deficiency, a broad-spectrum multivitamin is gap-insurance you probably don't need — you can't top up a tank that's already full. Worse, more is not better. A dose-response meta-analysis of 135,967 people concluded that “high-dosage (≥400 IU/d) vitamin E supplementation may increase all-cause mortality and should be avoided” (Miller 2005), and beta-carotene supplements raised lung-cancer risk in at-risk adults (Omenn 1996). The 23-in-1 megadose bottle is the exact wrong instinct.
When a multivitamin does earn its place
The honest flip side: a real nutrient gap is worth closing, and there the evidence is on your side. Pregnancy (folate), a vegan diet (B12), and little sun exposure (vitamin D) are genuine, common gaps where the right nutrient — not a mega-blend — matters. If you're going to take a multivitamin, that's the frame: cover a specific shortfall with sensible, well-formulated doses, not a mega-everything pill you hope will buy longevity.
So what should you actually do
Eat real food first — that's where the nutrients your body can use actually come from. If you have a real gap, fill it with a clean, sensibly-dosed multi: fully methylated folate and B12, chelated minerals, third-party tested, no megadosed fat-solubles. On that basis one product scored a 9.4 in our ranking — Thorne Basic Nutrients 2/Day — as gap-insurance done right, not a longevity drug.
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SOURCES
- Sesso HD et al. — JAMA 2012: Physicians' Health Study II, 14,641 men, 11.2-yr median — daily multivitamin “did not reduce major cardiovascular events” (HR 1.01) (PMID 23117775)
- Miller ER 3rd et al. — Ann Intern Med 2005: dose-response meta-analysis, 135,967 participants — “high-dosage (≥400 IU/d) vitamin E supplementation may increase all-cause mortality and should be avoided” (PMID 15537682)
- Omenn GS et al. — N Engl J Med 1996 (CARET): beta-carotene + vitamin A raised lung-cancer risk (RR 1.28) in at-risk adults (PMID 8602180)