Multivitamins are cheap, convenient, and offer some reassurance when our diet isn’t quite as healthy as we’d like. But a recent study of nearly 400,000 people spanning 20 years found that they didn’t help users live longer, and in fact showed a 4% increased risk of death. Ian Sample hears from JoAnn Manson, a professor of medicine at Harvard Medical School, to find out what the evidence tells us about the overall health benefits of multivitamins, and how consumers can navigate this vast and sometimes confusing market
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