Many women with PCOS exhibit symptoms of insulin resistance and metabolic syndrome, risk factors that raise the risk for heart disease and other problems like diabetes and stroke. Low magnesium levels are often associated with diabetes, and some research indicates that a dietary supplement of the mineral may improve insulin sensitivity, a factor in the development of type 2 diabetes and PCOS. One study found that overweight, insulin-resistant subjects who received 300 mg of magnesium at bedtime showed a significant improvement in fasting blood glucose and insulin levels, compared to subjects who received a placebo.
Cinnamon cassia One animal study compared the effectiveness of Cinnamomum cassia with metformin against controls in rats with PCOS. Hormone concentration was measured at 15 and 30 days  One pilot RCT demonstrated positive effects for metabolic parameter’s (HOMO and QUICKI) for Cinnamomum cassia in overweight women with PCOS  1. Equivalence for metformin for reduced testosterone in PCOS 
Herbal remedies can be a very effective treatment option for PCOS because they are usually quite gentle on the body and have fewer side effects than medication.3 You can usually use PCOS herbs longer with fewer problems which is important because PCOS does not go away over time. The reasons you might want to consider using herbs for your polycystic ovarian syndrome is they can be very successful in treating the contributing factors of PCOS, providing relief for symptoms and healing the body by boosting your immune system.