What Is L Carnitine: Benefits, Dosage, And Side Effects LiveLeanTV l Carnitine Supplementation in Recovery after Exercise 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 Supplements don't replace the workbut they can support it L Carnitine helps your body turn fat into usable energy, so you can push harder and recover better. Consistency first. Supplements second. Results