Injectable vs Oral L Carnitine: Which Works Better? AWP 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 Benefits of Acetyl L Carnitine Simply Supplements Role of L carnitine in exercise training: Anti inflammatory, antioxidant, and metabolic interactions ScienceDirect