RCT to investigate whether metformin co-treatment would improve IVF outcomes in overweight and obese women with PCOS.

Inclusion Criteria:

• The inclusion criteria restricted the patients to 39 years old with basal FSH < 10 IU/ml and normal TSH and prolacin.

Exclusion Criteria:

• Exclusion criteria were diabetes mellitus (excluded by GTT), renal or liver disease, associated male factor, documented tubal factor or pelvic adhesions, elevated 17 alfa hydroxyprogesterone level and FSH ≥10 IU/ml. We also excluded the women who started program or medications to reduce their weight and those who their partner has abnormal semen parameters according to the world health organization parameters (WHO, 2010)