The use of complementary and alternative medicine (CAM) is on the rise, especially among psychiatric patients. Acupuncture is considered a safe and effective treatment modality, and traditional Chinese medicine teaches that acupuncture harmonizes the body’s energies. Scientific research has found that acupuncture increases a number of central nervous system hormones. Acupuncture can have positive effects on depression and anxiety, although evidence is still lacking as to its true efficacy for these conditions.
— Behav Med. 2008 Summer;34(2):55-64. Acupuncture for psychiatric illness: a literature review.Samuels N, Gropp C, Singer SR, Oberbaum M.

The aim of this study was to evaluate the evidence for the efficacy of acupuncture in the treatment of anxiety and anxiety disorders by systematic review of the relevant research. Positive findings were reported for acupuncture in the treatment of generalized anxiety disorder or anxiety neurosis but there is currently insufficient research evidence for firm conclusions to be drawn. There is some limited evidence in favor of auricular acupuncture in perioperative anxiety. Overall, the findings indicate that further research is warranted in the form of well designed, adequately powered studies.
— Acupunct Med. 2007 Jun;25(1-2):1-10. Acupuncture for anxiety and anxiety disorders–a systematic literature review.Pilkington K, Kirkwood G, Rampes H, Cummings M, Richardson J.ter.ac.uk