Objective of the study was to evaluate the effect of combination of oral Coenzyme Q10 (CoQ10), with clomiphene citrate (CC) for ovulation induction in CC-resistant polycystic ovary syndrome (PCOS).In a prospective controlled randomized trial performed in a university hospital and private practice setting. One hundred ten infertile women with PCOS resistant to CC were randomized to either combined CC/CoQ10 (51 patients, 82 cycles) or CC 150 mg/day alone (50 patients, 71 cycles) for ovulation induction in patients with CC-resistant PCOS.

Main outcome measures: Number of follicles, serum E2, serum P, endometrial thickness, pregnancy rate (PR) and miscarriage rate.

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Inclusion Criteria:

• Diagnosis of PCOS based on the revised 2003 consensus on diagnostic criteria and long-term health risks related to PCOS (2003).
• All women were previously treated with 100 mg of CC daily for 5 days per cycle, for two to three cycles with persistent anovulation or ovulate with very thin endometrium <5 mm at the time of hCG administration

Exclusion Criteria:

• patients with hyperprolactinaemia,
• hypercorticism and
• thyroid dysfunction.
• patients receiving medications as cholesterol lowering drugs, as statins, beta-blockers, and tricyclic antidepressants