Carnitine: the claims and why it may not work 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 Nutrient Tip Tuesday: Meet the Fat Burning Powerhouse: L Carnitine This essential nutrient acts as a shuttle, transporting fatty acids directly into your mitochondria to be burned for ATP (energy). Essentially, it helps your Source Naturals, Acetyl L Carnitine, 500mg, 60 ct