Does L Carnitine Work for Fat Loss? A Dietitian Explains 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. Polycystic Ovary Syndrome (PCOS): Symptoms & Nutritional Strategies. Life Extension L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians Acetyl L Carnitine Powder 150g Applied Nutrition H&B Role of L carnitine in female infertility Reproductive Biology and Endocrinology Springer Nature Link