Effect of Vitamin D on Ovulation Rate in Women With Polycystic Ovary Syndrome

This trial tests whether vitamin D supplements can improve ovulation rates in women with polycystic ovary syndrome (PCOS), a hormonal condition that often causes irregular periods and difficulty ovulating. **You may be eligible if...** - You are premenopausal and aged 18–40 - You have been diagnosed with PCOS (using the Rotterdam criteria) - Your menstrual cycles are irregular (more than 35 days apart) - You are willing to have transvaginal ultrasounds **You may NOT be eligible if...** - You have used hormonal medications (including birth control) in the past 3 months - You have kidney or liver failure, kidney stones, or parathyroid disease - You are currently taking insulin-sensitizing, cholesterol-lowering, or blood pressure medications - You have type 2 diabetes - Your blood calcium levels are abnormal Talk to your doctor to see if this trial is right for you.