Doctor's Best Acetyl-L-Carnitine with Biosint Carnitines 500mg 60 CapsulesAcetyl-L-Carnitine (ALC) is a naturally occurring form of L-Carnitine, a vitamin-like nutrient synthesized in the body from the amino acids lysine and methionine.ALC plays a key role in the production of acetylcholine, an impo..