Metabolic clues could lead to potential treatment in complex critical illnesses University of Michigan Medical School 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 Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota Acetyl L Carnitine Head to Toe Wellness Guide Updated Andrew Weil, M.D.