http://nccam.nih.gov/health/stjohnswort/index.htm
National Center for Complementary and Alternative Medicine, National Institutes of Health
The National Center for Complementary and Alternative Medicine (NCCAM) has developed this fact sheet on the use of St. John's wort for depression. It is one of a series of fact sheets intended to help consumers make informed decisions about whether to use complementary and alternative medical (CAM) therapies for a disease or medical condition.