The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation When to Take L Carnitine for Optimal Training Benefits Transparent Labs Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get New study links L carnitine in red meat to heart disease Harvard Health L Carnitine: Benefits, side effects, and dosage