Open the cabinet. Pop the multivitamin. Swallow it with coffee, feel responsible. The same ritual every morning. That sense of coverage — of bases covered, insurance filed — costs about $480 a year on average. What follows is what 5.5 million clinical trial participants found that coverage is worth to your body.
You can dispute one study. You can question ten. But when nineteen separate large-scale reviews — each one a study of studies — land on the same answer, the question is settled.
The largest analysis ever conducted on multivitamins — a review that pooled every major review before it — was published in 2025, pooled the evidence from all of them. The result for all-cause mortality: nothing. Heart disease: nothing. Cancer: nothing. Infections: nothing. Zero measurable benefit across every major health outcome in healthy adults.
A separate review looked at 128 studies on minerals in athletes — over 3,600 people. Same pattern. No boost in exercise for anyone who wasn't running low. The pill isn't doing what the label implies.
The Two Things That Actually Worked
The evidence isn't perfectly zero. Two findings survived.
The COSMOS trial found a modest cognitive benefit in adults over 60 taking one specific multivitamin brand. The effect was small — roughly two fewer years of mental decline over three years of daily use. One formulation, one age group, one outcome.
Separately, high-dose B vitamin pills showed a small drop in stress. But these were specialized pills, not the standard multivitamin on your shelf.
If you're over 60 and considering cognitive protection, these findings are worth discussing with your doctor. If you're under 60 and taking a multivitamin for general health or training, neither applies to you.
The Part Nobody Mentions
Here's where the "at least it can't hurt" argument falls apart.
Across 13 clinical trials and 85,321 participants, multivitamin users had double the risk of a serious eye disease called macular degeneration. This wasn't a fringe finding buried in a low-quality journal — it came from the same massive analysis that measured mortality.
There's a second harm signal for anyone who trains. The world's largest sports nutrition body published a 2026 position stand on this. Their finding: taking high-dose antioxidants over time — the kind in many multivitamins — may blunt the gains your body is trying to make.
Your body uses the stress from hard training as a signal to grow. Flooding it with antioxidants can muffle that signal.
The supplement you take for your training might be working against it.
The Wrong Question Entirely
The real problem isn't that vitamins don't work. They do — when you're actually deficient in one, at a dose that works.
The problem is the shotgun approach: 20+ nutrients fired at your body, most at doses too low to matter, without knowing which ones you need. Individual supplementation for a confirmed deficiency is the scalpel — and across every major review, the scalpel works and the shotgun doesn't.
The $50 Test That Replaces the $480 Pill
Here's what the evidence points to: the multivitamin is the wrong tool. The right one is finding out what you actually need.
A blood panel — ferritin for iron, vitamin D, zinc — costs $50 to $150. One test tells you exactly what's low. That single panel replaces years of buying a $40-a-month pill that addresses nothing specific.
The most common gaps in active people, across every study in this evidence base: iron (up to 60% of female athletes), vitamin D (36–56% of athletes, more so in winter), and zinc (athletes lose extra through sweat). Each one responds to a focused supplement at the right dose. None responds to the tiny amounts in a multivitamin. The mineral-by-mineral breakdown maps what each targeted supplement achieved — from iron's sharp dose line to magnesium's early but unfinished signal.
That iron number — 60% — deserves its own page. Up to three in five female athletes have iron levels low enough to quietly drag on their stamina. What they're missing and why nobody catches it is a different story.
The cost comparison tells the story. A $50–150 blood panel tests for the three deficiencies most common in active people — iron, vitamin D, and zinc — and gives you a specific answer.
A daily multivitamin costs roughly $480 a year and addresses none of them at therapeutic doses. The panel replaces the guesswork. Most people who test find out they don't need to supplement anything at all — which means the multivitamin was pure waste.