PCOS, like diabetes, is a disorder of the endocrine system. Many women with PCOS - like myself - are "prediabetic" with elevated levels of insulin in the blood.

The metformin somehow - and actually doctors still aren't 100% sure how - helps reduce the testosterone levels enough for menstrual cycles to start working...well...I guess "properly" but unfortunately for me, periods are pretty horrible for the first few days.