In the US, the supplement industry is much less regulated than the pharmaceutical industry. The concern is not excessive, at least in the US. Consider https://

In the US, the supplement industry is much less regulated than the pharmaceutical industry. The concern is not excessive, at least in the US. Consider https://consumerist.com/2016/07/27/anyone-can-make-market-a-dietary-supplement-including-consumer-reports/ https://consumerist.com/2016/07/27/anyone-can-make-market-a-... : > While real drugs — prescription or over-the-counter — must demonstrate levels of safety and effectiveness before hitting store shelves, dietary supplements are effectively regulated like food products. https://consumerist.com/2016/01/20/7-things-you-need-to-know-from-frontlines-investigation-on-supplements-safety/ https://consumerist.com/2016/01/20/7-things-you-need-to-know... gives a summary of a Frontline episode on the topic; Frontline does documentaries on public affairs topics. Or, from 2001, http://ajcn.nutrition.org/content/73/6/1101.full http://ajcn.nutrition.org/content/73/6/1101.full - "All plant products were correctly identified by botanical plant species (ie, Panax species or E. senticosus); however, concentrations of marker compounds differed significantly from labeled amounts. There was also significant product-to-product variability: concentrations of ginsenosides varied by 15- and 36-fold in capsules and liquids, respectively, and concentrations of eleutherosides varied by 43- and 200-fold in capsules and liquids, respectively." Or from the 1990s, http://www.sportsci.org/jour/0003/lmb.html http://www.sportsci.org/jour/0003/lmb.html : > Analysis of 16 commercial DHEA products revealed that only half the products contained the amount of DHEA stated on the product label; content varied from 0 to 150% of the stated content (Parasrampuria et al., 1998). > Melatonin supplements have failed to meet quality claims or delivery profiles stated on their labels (Hahm et al., 1999). It lists others as well.