Most supplements were a waste of money, offering no protection against illness.
For nearly half of British adults, the morning vitamin has become a quiet act of faith — a small ritual of self-care purchased at considerable collective cost. A sweeping analysis of 277 clinical trials, drawing on nearly a million participants, now asks whether that faith is warranted, finding that most supplements offer no measurable protection against heart disease or early death, and that at least one popular combination may quietly increase harm. In the long human search for shortcuts to health, the evidence continues to counsel patience with complexity over confidence in capsules.
- Nearly half of UK adults take daily supplements, sustaining a half-billion-pound industry built on the promise of protection that the science largely cannot deliver.
- A calcium and vitamin D combination — among the most trusted pairings in wellness culture — was linked to a higher risk of stroke, inverting the safety many users assumed.
- Only fish oil and folic acid emerged with genuine protective effects, while celebrated regimens like the Mediterranean diet showed no cardiovascular benefit in the trials examined.
- Experts caution that the analysis has real limits: key findings rest on a single Chinese study, and most dietary research depends on memory-based food diaries prone to error.
- Official guidance in both the US and UK already advises against routine supplement use, and this study sharpens that position — leaving millions of daily pill-takers with an uncomfortable question about their morning habit.
Nearly half of all British adults begin their day with a vitamin or mineral supplement, sustaining an industry worth half a billion pounds on the promise of better health. A major new analysis suggests that promise is largely unfulfilled — and occasionally reversed.
Researchers at the University of West Virginia examined 277 randomised trials involving close to a million participants, testing 16 supplements and eight dietary interventions against cardiovascular outcomes and mortality. The results were stark. Only two supplements demonstrated genuine protective value: fish oil reduced heart attack risk, and folic acid reduced stroke risk. Everything else, including multivitamins and popular mineral formulations, showed no meaningful benefit. The lead researcher, Dr. Safi Khan, was direct — most supplements amounted to wasted money.
The most unsettling finding involved calcium taken alongside vitamin D, a pairing widely associated with bone health. Rather than offering protection, the combination was linked to an elevated stroke risk. Meanwhile, dietary interventions fared little better. The Mediterranean diet, a fixture of health journalism and US dietary guidelines, showed no cardiovascular benefit in the trials reviewed. Reducing fat intake and switching fat types also failed to move the needle. The only dietary changes that mattered were precise: cutting salt helped people with normal blood pressure live longer, and omega-3 fats — found naturally in oily fish — protected against heart attacks.
The analysis is not without its limits. Reviewer Dr. Eric Topol noted that the apparent benefit of folic acid was driven largely by a single Chinese study conducted in a population with low dietary folate — a context that may not translate broadly. Most dietary research also depends on food diaries, which are notoriously unreliable. These caveats matter, but they do not overturn the central finding: for the millions who take supplements as quiet insurance against illness, the science offers little reassurance that the habit is doing what they hope.
Nearly half of all British adults swallow a vitamin or mineral pill every morning, a habit that fuels a half-billion-pound industry built on the promise of better health. A sweeping new analysis suggests they might as well be throwing their money away—and in some cases, doing themselves harm.
Researchers at the University of West Virginia examined 277 randomized trials spanning nearly a million participants to test what supplements and dietary changes actually protect the heart. The scope was ambitious: they looked at 16 different nutritional supplements and eight dietary interventions, measuring their effects on mortality and cardiovascular outcomes. What they found was sobering. Of all the supplements tested, only two showed genuine protective value. Fish oil reduced the risk of heart attack. Folic acid reduced the risk of stroke. Everything else either did nothing or, in at least one case, made things worse.
The most striking finding concerned a combination many people take together: calcium and vitamin D. Rather than strengthening bones and protecting the heart as marketed, the pairing was associated with a higher stroke risk. Other popular supplements—multivitamins, various mineral formulations—showed no meaningful effect on whether people lived longer or stayed free from heart disease. The lead researcher, Dr. Safi Khan, put it plainly: most supplements were a waste of money, offering no protection against illness.
The dietary interventions fared little better. The Mediterranean diet, celebrated in health journalism and endorsed in official US dietary guidelines, showed no cardiovascular benefit in the trials examined. Neither did reducing overall fat intake, switching to different types of fat, or cutting saturated fat. The only dietary changes that mattered were narrow and specific: reducing salt intake helped people with normal blood pressure live longer, and omega-3 fats—the kind found naturally in fish—protected against heart attacks and coronary disease. But these were exceptions, not rules.
The findings carry weight because they synthesize decades of research rather than relying on a single study. Yet the analysis has limits worth noting. Dr. Eric Topol, who reviewed the work for the journal that published it, flagged a crucial problem: the evidence itself is unreliable in places. The apparent benefit of folic acid, for instance, was largely driven by a single Chinese study conducted in a population where folate-rich diets are uncommon. Most dietary studies rely on food diaries—people's memories of what they ate—which are notoriously inaccurate. Geographic differences between studies matter too, and they were not always accounted for.
Still, the message from official health bodies is now clear. The US dietary guidelines do not recommend routine supplement use for preventing heart disease or other chronic conditions. The evidence simply does not support it. For the 46 percent of British adults taking vitamins daily, the implication is uncomfortable: the ritual they have built into their morning routine, the small expense they accept as insurance against illness, may be neither protective nor necessary. The industry will continue to thrive on hope and habit. But the science, at least, is moving in a different direction.
Notable Quotes
We found out only a few of the 16 nutritional supplements and one of the eight dietary interventions evaluated had some protective effect in cardiovascular risk reduction.— Dr. Safi Khan, University of West Virginia
A combination of calcium and vitamin D was associated with a higher risk of stroke.— Dr. Safi Khan
The Hearth Conversation Another angle on the story
Why would calcium and vitamin D together actually increase stroke risk? That seems counterintuitive—aren't they supposed to work together?
The study doesn't explain the mechanism, just documents that the combination showed higher stroke risk in the trials. It's a reminder that supplements don't always behave the way we assume they will. The body is complex.
So if most supplements don't work, why do nearly half of British adults take them?
Habit, mostly. And marketing that's been very effective over decades. Once something becomes part of your morning routine, you don't question it. The industry is worth half a billion pounds—that kind of money buys a lot of shelf space and reassurance.
The study looked at 277 trials. That's a lot of evidence. Why isn't this more definitive?
Because the trials themselves have problems. People filling out food diaries are guessing at what they ate weeks ago. A study from China where folate is rare tells you something different than a study from somewhere else. You're stacking uncertainty on top of uncertainty.
What about fish oil and folic acid—those actually worked?
They did, in the trials examined. But even there, you have to ask: are you taking a supplement to get fish oil, or could you just eat fish? That's the practical question the research doesn't quite answer.
What happens now? Do people stop taking supplements?
Probably not many will. This is the kind of finding that gets published, gets some attention, and then people keep doing what they were doing. Changing a daily habit requires more than evidence. It requires a reason to believe you were wrong.