L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians Is L Carnitine safe for athletes at doses up to 6000 mg day? Consensus Coenzyme Q10 200mg CoQ10 with ALA and ALCAR Nature's Lab Corebolics L Carnitine Liquid (450 ml, 30 serving) 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