Nutritional Supplements and Complementary Therapies in Polycystic Ovary Syndrome Advances in Nutrition L Carnitine has become one of the most commonly asked about supplements over the past 18 months and I can see why when looking at all the research that has come out about it over the last 2ish years., Polycystic Ovary Syndrome (PCOS): Symptoms & Nutritional Strategies. Life Extension Role of Oxidative Stress and Carnitine in PCOS Patients IntechOpen