Is L Carnitine safe for athletes at doses up to 6000 mg day? Consensus 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 Acetyl L Carnitine L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians Alpspure Nutra L Carnitine Tablets with Chromium Picolinate, Piperine For Men & Women pack of 2 (60 Tablets Each) Pre Workout Supplement Supports