Why is there a lack of evidence about complementary and alternative treatments?
One reason for the lack of research in complementary and alternative treatments is that large, carefully controlled medical studies are costly. Trials for conventional medications or procedures are often directly or indirectly funded by the government or drug companies, giving conventional treatments more resources to do studies. CAM trials are more difficult to fund, so there are fewer trials. Nonetheless, a number of studies are under way on CAM treatments ranging from herbs to yoga. The National Center for Complementary and Alternative Medicine is the lead U.S. agency that supports research into complementary and alternative treatments, and it makes research findings available on its Web site.
