Full article: Improved insulin sensitivity and reproductive profile in overweight obese PCOS patients undergoing integrative treatment with carnitines, L arginine, L cysteine and myo inositol L Carnitine: Benefits, Uses, and Side Effects Lifespan Research Institute Acetyl l Carnitine Ameliorates Metabolic and Endocrine Alterations in Women with PCOS: A Double Blind Randomized Clinical Trial Advances in Therapy Springer Nature Link A Functional Medicine Approach to PCOS Acetyl L Carnitine 500 mg (60 Count) Compounding Pharmacy of America 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.