Abstract:Objective: To investigate the effects of Yangyin Shugan capsule on ovarian function in patients with primary ovarian insufficiency (POI), and explore its mechanism of action. Method: In this randomized, double-blind trial, 60 patients with POI were recruited and randomly divided into treatment group (Yangyin Shugan capsule, 4 capsules/time, po, tid) and control group (placebo therapy, 4 capsules/time, po, tid), 30 cases in each group. All patients were treated for 12 weeks. After treatment, the sex hormone levels (FSH, LH), antral follicle count and ovarian blood were compared between the two groups. Result: As compared with control group, the levels of basal follicle-stimulating hormone (bFSH) and basal luteinizing hormone (bLH) were significantly lower in treatment group, so it was believed that Yangyin Shugan capsule had better effect on improving bFSH, bLH levels (P<0.05); the antral follicle count and ovarian blood flow were significantly improved in treatment group (P<0.05). Conclusion: Yangyin Shugan capsule can effectively regulate the basal sex hormone levels, increase the basal antral follicle counts and improve blood flow to improve the ovarian function in patients with POI, with obvious clinical efficacy.