Though the exact mechanism as to how acupuncture works is still considered elusive to some, governing bodies such as the NIH, WHO, and numerous hospitals and research groups have shown the efficacy of acupuncture for a wide variety of conditions. Here is a sample of some articles citing research showing its favorable results.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3754836/

http://apps.who.int/medicinedocs/pdf/s4926e/s4926e.pdf

http://www.scientificamerican.com/article/can-acupuncture-curb-killer-immune-reactions/?&WT.mc_id=SA_HLTH_20140506

http://well.blogs.nytimes.com/2012/09/11/acupuncture-provides-true-pain-relief-in-study/?_php=true&_type=blogs&_r=0