A group of scientists from GuangZhou, China compared application of acupuncture for PCOS (Polycystic Ovaries Syndrome) with medicinal treatment. After treating 60 woman with acupuncture and another 61 with medication, the scientists found that acupuncture group and medication group both showed an improvement in hormone levels, ovulation and other. However after six cycles past the treatment, the hormone levels of women who underwent the conventional treatment returned to their pre-treatment levels, while the acupuncture group continued to show improved results. Furthermore, the pregnancy rate in the acupuncture group was significantly higher.
The researchers concluded that acupuncture therapy has obvious effect on PCOS and the therapeutic effect is long-term.

Zhongguo Zhen Jiu. 2007 Feb;27(2):99-102.