There are two kinds of Complementary and Alternative Medicine (CAM) - the ones that involve actually doing stuff, and the ones that don't.
Things like herbal medicine, chiropractic, and acupuncturecould plausibly make someone better, as more than just a placebo, given what we know about physics and chemistry, because they involve physically acting on the body. I don't claim to know whether they do in fact work, but in theory, they could.
