If the pharmaceutical generics are so often not up to standards, what about the quality control on supplements and vitamins? Who's monitoring these?

DNA barcoding detects contamination and substitution in North American herbal products

Herbal products available to consumers in the marketplace may be contaminated or substituted with alternative plant species and fillers that are not listed on the labels. According to the World Health Organization, the adulteration of herbal products is a threat to consumer safety. Our research aimed to investigate herbal product integrity and authenticity with the goal of protecting consumers from health risks associated with product substitution and contamination.


http://www.biomedcentral.com/1741-7015/11/222/abstract