Endocrine and clinical effects of myo-inositol administration in polycystic ovary syndrome. A randomized study

Objective: To evaluate the effects the administration of myo-inositol (MYO) on hormonal parameters in a group of polycystic ovary syndrome (PCOS) patients. Design: Controlled clinical study. Setting: PCOS patients in a clinical research environment. Patients: 50 overweight PCOS patients were enrolled after informed consent. Interventions: All patients underwent hormonal evaluations and an oral glucose tolerance test (OGTT before and after 12 weeks of therapy (Group A (n 1/4 10): MYO 2 g plus folic acid 200 mg every day; Group B (n 1/4 10): folic acid 200 mg every day). Ultrasound examinations and Ferriman-Gallwey score were also performed. Main outcome measures: Plasma LH, FSH, PRL, E2, 17OHP, A, T, glucose, insulin, C peptide concentrations, BMI, HOMA index and glucose-to-insulin ratio. Results: After 12 weeks of MYO administration plasma LH, PRL, T, insulin levels and LH/FSH resulted significantly reduced. Insulin sensitivity, expressed as glucose-to-insulin ratio and HOMA index resulted significantly improved after 12 weeks of treatment. Menstrual cyclicity was restored in all amenorrheic and oligomenorrheic subjects. No changes occurred in the patients treated with folic acid. Conclusions: MYO administration improves reproductive axis functioning in PCOS patients reducing the hyperinsulinemic state that affects LH secretion.