A study conducted from 1999 to 2012 by the Journal of American Medicine (JAMA) found that the overall use of dietary supplements remained constant for more than a decade. Whether or not a supplement had a strong advertising presence or favorable testimonials had little impact on sales.
A piece by Dr. Pieter A. Cohen published alongside the study argued that, for the majority of adults, supplements provide little to no benefit. Only in a few cases, in the opinion of Dr. Cohen, did conclusive scientific evidence have a possible effect on the sale of supplements. Cohen states,
The rates of vitamin C, vitamin E and selenium use decreased, perhaps in response to research findings showing no benefit…Other products continued to be used at the same rate despite major studies demonstrating no benefit over placebo.
Cohen does say that supplements, when recommended by a doctor, are a good choice for those with vitamin or mineral deficiencies.
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