Acupuncture has moderate RCT evidence for chronic pain (low-back pain, knee osteoarthritis, headache prophylaxis) and chemotherapy nausea; but the extra benefit of "real" over "sham" needling is small—most of the effect comes from needling itself plus a strong expectation/ritual effect. For most other claimed indications (infertility, asthma, weight loss, "detox") the evidence is weak or negative.