Adding L carnitine to antagonist ovarian stimulation doesn't improve the outcomes of IVF ICSI cycle in patients with polycystic ovarian syndrome: a double blind randomized clinical trial Journal of Ovarian Research Springer PCOS Nutrition Center L Carnitine (120 Capsules) 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. How L Carnitine Helps with Fat Metabolism Role of L carnitine in female infertility Reproductive Biology and Endocrinology Springer Nature Link