Carnitine: Which type is right for you? 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 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 Tartrate Walgreens Free & Pure L Carnitine 500 mg Capsules L Carnitine Tartrate Vs Acetyl L Carnitine