L Carnitine is not a magic fat burner It won't melt fat, build muscle, or replace hard work. The only thing it burns is your money Stick to the basics Meet L Carnitine a naturally occurring amino acid that plays a key role in helping the body convert fat into usable energy. It works by transporting fatty acids into your cells to The Role of L Carnitine in Kidney Disease and Related Metabolic Dysfunctions When to take L carnitine: Dosage, forms, and side effects