Acetyl-L-Carnitine 500mg by Now Foods 50 Capsule Acetyl-L-Carnitine (ALC) is a stabilized form of the amino acid metabolite L-Carnitine and is utilized in the same manner in the body. ALC plays an important role in the transfer and utilization of long-chain fatty acids. These fatty acids are then subjected to beta-oxidation for the production of energy. Since levels of this nutrient decline with age supplementation is key to receive adequate amounts.