What Is Carnitine and Why Is It Important? The Amino Company Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get 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 Is L Carnitine safe for athletes at doses up to 6000 mg day? Consensus Liquid L Carnitine Energy, Metabolism & Fat Burning