L Carnitine has a range of benefits for women with PCOS but, a new study set out to look at carnitine's impact on some of PCOS key indicators. One of those benefits reported A Functional Medicine Approach to PCOS 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 12 Best PCOS Supplements for Hormone Balance, Fertility & Symptom Relief Mira Fertility Shop 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.