L Carnitine: Benefits, Dosage, Side Effects, and Food Sources Dr. Rogers Centers.com A Functional Medicine Approach to PCOS Role of Oxidative Stress and Carnitine in PCOS Patients IntechOpen L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy. 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., Benefits of L Carnitine for PCOS: Improve Insulin Resistance & Weight Loss