Two very reputable organizations, Natural Standard (www.naturalstandard.com) and Natural Medicines Comprehensive Database (www.naturaldatabase.com) produce high-quality scientific reviews on topics in alternative and complementary medicine. These are available as subscription services.

You can find abbreviated versions of selected Natural Standard herb and supplement reviews at www.medlineplus.gov. Click the link on the left side of the screen for "Drugs and Supplements" to find these.