Acetyl L Carnitine VS L Carnitine: Which is Better? Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health 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 ACETYL L CARNITINE STRONG LIQUID vial 25 ml L Carnitine Linus Pauling Institute Oregon State University