One in three adults in the United States takes a daily multivitamin. Not because a doctor prescribed it. Not because a blood test came back low. Because it feels like the right thing to do.
The logic is hard to argue with. Your diet probably has gaps, the pill fills them, it costs less than a dollar a day, and the downside is zero. You swallow it with your morning coffee the same way you lock the front door: not because you expect a break-in, but because it would feel careless not to.
The assumption met a test. 390,124 generally healthy adults, tracked for up to 27 years, submitted the longest answer this question has ever received.
Do Multivitamins Actually Work?
Daily multivitamin use showed no mortality benefit in the largest study ever conducted on the question. Heart disease, cancer, and cerebrovascular disease outcomes were no different between daily users and nonusers. If anything, the signal pointed slightly in the wrong direction.
— Loftfield et al. 2024 · JAMA Network Open · n=390,124
The direction is what stings. Daily users didn't just show no benefit. They showed a 4% higher mortality risk than people who took nothing. The association held across both halves of the follow-up. It held for heart disease. It held across age groups. The study is observational, which means confounding could explain part of the signal. But the data had 27 years and nearly 8 million person-years to find even a whisper of benefit. It found none.
One genuine exception sits in a different corner of the evidence. Older adults over 65 showed improved memory and cognition with daily multivitamin use in a separate clinical trial. The benefit is real, and it matters. But cognition in your seventies is a different question than the one you asked when you put the bottle next to your coffee maker.
The pill was never insurance. It was comfort. The feeling of doing something responsible without checking whether the something worked. And the supplement industry built its largest aisle around that feeling.
Your daily multivitamin was never insurance. It was the feeling of doing something responsible without checking whether the something worked.
Your instinct to supplement isn't wrong. It's pointed at the wrong shelf. Creatine has evidence that holds past 50. Caffeine, dosed right before training, improves performance you can feel the same session. Protein supplementation fills gaps when food falls short. Three supplements with decades of evidence behind them.
The bottle on your counter isn't one of them.