L carnitine Effect, intake, dosage and much more BIOGENA International Polycystic Ovary Syndrome (PCOS): Symptoms & Nutritional Strategies. Life Extension 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., Role of Oxidative Stress and Carnitine in PCOS Patients IntechOpen