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During the past 20 years, studies have shown little benefit from most dietary supplements, but whether such results have influenced supplement use is unclear. Researchers used a national health and nutrition database to assess use of vitamins, minerals, and other dietary supplements among nearly 38,000 adults during seven 2-year study cycles from 1999 through 2012.
During the 14-year study period, overall supplement use did not change: 52% of respondents reported recent use (i.e., during the previous 30 days) of any dietary supplements in 1999–2000 and in 2011–2012. However, use of several individual supplements fell significantly between the first and last surveys, including multivitamins (from 37% to 31%), vitamin C (42% to 36%), vitamin E…