Is L Carnitine safe for athletes at doses up to 6000 mg day? Consensus Benefits of Acetyl L Carnitine Simply Supplements 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 Ingredient Spotlight: L Carnitine Source: Biosynthesised in the body from the amino acids Lysine and Methionine, L Carnitine is a conditionally essential nutrient involved in energy metabolism and fat transport. Key Benefits Coenzyme Q10 200mg CoQ10 with ALA and ALCAR Nature's Lab