![]() The researchers behind this new study point out over half of all Americans take some kind of dietary vitamin supplement every day, making the industry more than US$30 billion a year. Both of those studies concluded that if you are a healthy adult, with no specific diagnosed deficiency, then vitamin and mineral supplements will not confer any extra health boost, or longevity bonus. Two 2018 studies using similar umbrella review strategies, came to much the same conclusions. This is not the first large-scale meta-review to conclude vitamin supplements are essentially useless in healthy adults. This conclusion was generated from 20 trials looking at the effects of the combined supplements. When taken alone these two supplements showed no health risks or benefits, but taken together they showed a 17 percent increased risk of stroke. ![]() The only supplement intervention that actually increased mortality or cardiovascular risk was calcium and vitamin D supplements. "Our analysis carries a simple message that although there may be some evidence that a few interventions have an impact on death and cardiovascular health, the vast majority of multivitamins, minerals and different types of diets had no measurable effect on survival or cardiovascular disease risk reduction," explains Safi Khan, lead author on the new research. Both omega-3 and folic acid supplements showed small beneficial effects, but the researchers ranked these interventions as of a low impact. Unsurprisingly, the most relevant result was the finding that low-salt diets reduced heart disease and death by around 10 percent in healthy subjects. Only three specific interventions displayed associations of any statistical significance. Almost all the supplements reviewed, including multivitamins, selenium, vitamin A, vitamin B6, and vitamin D, showed no association with either increased or decreased risk of death or heart disease. The new study gathered data from a large number of randomized clinical trials examining 16 vitamin supplements and their associations with general mortality and cardiovascular conditions such as heart attack or stroke. A massive umbrella study, encompassing 277 clinical trials, into the effects of nutritional supplements and dietary interventions has concluded almost all vitamin and mineral supplements play no role in protecting from cardiovascular disease, or extending one's lifespan.
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