Yes, L Carnitine works best once you take it before exercising and when you have calories to burn., But, it works just as well when you take it before sleeping., Get yours now! , L Carnitine Liquid 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 Should I use L Carnitine on rest days or just before workouts? L Carnitine for fat loss and diet IronMaxx IronMaxx Nutrition When to Take L Carnitine for Optimal Training Benefits Transparent Labs