Acetyl L Carnitine VS L Carnitine: Which One Is Better? Most people talk about carnitine like it is one supplement. It is not. Acetyl L carnitine and L carnitine L tartrate do different jobs, and picking the wrong one for the wrong goal is where people l Carnitine Supplementation in Recovery after Exercise Carnitine octanoyltransferase is important for the assimilation of exogenous acetyl L carnitine into acetyl CoA in mammalian cells Journal of Biological Chemistry