Millions of people around the world spend time and money on healthcare remedies that mainstream science considers ineffective (in the sense of being no more effective than a placebo), like homeopathy and acupuncture. A study published recently in Psychology and Health investigated how to address this issue in the context of multivitamins, which evidence suggests provide no benefit for healthy people – and may even cause harm in some contexts.
Despite this research evidence, huge numbers of healthy people take multivitamins because they appear to be helpful. Scientists refer to this as the “illusion of causality”: when someone takes a vitamin and then their cold goes away, for example, they may believe it was the vitamin that cured them, even though they would have recovered just as quickly anyway. Past research has shown that simply giving people the raw outcomes of clinical trials that show remedies to…
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