Unfortunately, potency issues and lead contamination are becoming frequent travelling companions, evidenced by recent findings from ConsumerLab.com about St. John's wort and its latest report on ginseng, one of the more popular herbal supplements used by Americans.

Out of 11 supplements tested by ConsumerLab.com, five failed to make the grade. Two brands exceeded safe exposure limits for lead in California (0.5 micrograms per day), ranging from three to six times. In one product, researchers also found traces of quintozene, a pesticide used, among other things, to treat seeds used in growing field crops and vegetables.

Three more supplements contained lesser amounts of ginsenosides, the active compounds in ginseng, ranging from 60-75 percent, including two products containing only American ginseng (Panax quinquefolius L.).

All the more reason, you should be scrutinizing the supplements you take, not only for the impact they have on your bank account, but their quality, safety and purity. Before you consider another supplement, please take a moment to review CNCA's Nutritional Supplement Quality -- The Facts, then talk to your doctor before selecting one.

ConsumerLab.com August 16, 2010 Subscription Required