The New York State attorney general’s office investigated herbal supplements being sold at GNC, Target, Walgreens and Wal-Mart, and found that many don't contain the ingredients on the label.
Those store-brand ginkgo biloba tablets you bought may contain mustard, wheat, radish and other substances decidedly non-herbal in nature, but they’re not likely to contain any actual ginkgo biloba… All four [ratilers] have received cease-and-desist letters demanding that they stop selling a number of their dietary supplements, few of which were found to contain the herbs shown on their labels and many of which included potential allergens not identified in the ingredients list.
GNC, Target, Wal-Mart, Walgreens accused of selling adulterated ‘herbals’