L Carnitine: Benefits, Dosage, Side Effects, and Food Sources Dr. Rogers Centers.com 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 Role of Oxidative Stress and Carnitine in PCOS Patients IntechOpen A Functional Medicine Approach to PCOS 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.