Inclusion Criteria:  Age: 18-40 years 2- Polycystic ovarian syndrome diagnosis made according to ESHRE/ASRM criteria.  Polycystic ovaries (either 12 or more follicles or increased ovarian volume [> 10 cm3 Oligo-ovulation or anovulation Clinical and/or biochemical signs of hyperandrogenism (Azziz, 2006). 3- PCOS infertile women resistant to CC for 3 cycles. clomiphene citrate resistance means failure to ovulate with 3 months use of clomid at 150 mg/day for 5 days  Exclusion Criteria:  Causes of infertility other than PCOS.  Male factor.(normal semen analysis) Other factors e.g. endometriosis Tubal factor. (normal hysterosalpingography) Premature ovarian failure: Day 3 FSH > 14 mlu/ml or antimullerian hormone <1 ng/ml. Normal ultrasound except for criteria of PCO Causes of anovulation other than PCOS. Patients with hyperprolactinemia Patients with thyroid dysfunction. Current or in last six months use of vit D treatment.