Here's an explanation about "Complementary and Alternative Medicine" (also know as CAM). This particular video is part of a series that examines specific modalities in depth.
Here's a video that explains how this all happened. I don't agree with the speaker's perception that Yoga is harmless but the rest of the talk is excellent
Even trying to understand the jargon related to Alternative medicine can be confusing. Trying to assess it's effectiveness is even harder. Here's an article that examines these issues:
Complementary and Alternative Medicines and Cancer
