Carnitine: the claims and why it may not work 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 Acetyl L Carnitine 500 mg Creatine & Acetyl L Carnitine Energy Plus, 0.51 lb Life Extension L Carnitine Injection Levocarnitine IV Role of L carnitine in exercise training: Anti inflammatory, antioxidant, and metabolic interactions ScienceDirect