BeastLife Carnipure L Carnitine Tartrate Capsule L carnitine is effective for both fat loss and athletic performance. However, oral L carnitine has lower bioavailability and can be harmful at high doses, so it should be avoided. , Even cardiologists L Carnitine Tartrate, 240 Capsules (500 mg per Capsule) l carnitine: Nutrition, pathology, and health benefits ScienceDirect 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