SAN - ALCAR 750 contains acetyl-L-carnitine - the most digestible form of L-carnitine, a natural amino acid produced by the body to convert fatty acids into energy. Composition Serving Size: 1 Tablet Acetyl-L-Carnitine - 750 mg. Ingredients: stearic acid, silica, microcrystalline cellulose. Directions: Take one serving 3-4 times daily.