L Carnitine: Uses, Benefits, Dosage, and Side Effects StrengthLog Both taurine and L carnitine play roles in muscle function, and their combination could potentially enhance muscle health, recovery and weight management. Dr. Thacker breaks down the differences of taurine and L carnitine in Role of L carnitine in female infertility Reproductive Biology and Endocrinology Springer Nature Link 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.