Acupuncture has been shown to improve the blood flow to the ovaries by inhibiting activity in the sympathetic nervous system triggered by stress. When you get stressed, your body activates the sympathetic nervous system (the fight or flight response), disrupting the hypothalamic-pituitary-ovarian axis. These are the main endocrine glands associated with reproductive health. Stress also causes your ovarian arteries to constrict, reducing the blood flow to the ovaries.
Acupuncture can improve the thickness of the endometrial lining (lining of the uterus) to assist with implantation by increasing blood flow to the area. Research has shown the ability to balance hormones and treat PCOS, improve sperm/egg quality, lead to improved pregnancy rates, and more.