According to the author of this review, only 7.4 per cent of complementary and alternative medicine (CAM) — which includes homeopathy and acupuncture — is evidence-based. The author evaluates research evidence from clinical trials and systematic reviews to reach this conclusion. By contrast, he says, more than half of all interventions in general internal medicine, and more than 65 per cent in psychiatry are based on sound evidence, including results from randomised controlled trials.