L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage 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 What Is L Carnitine? How Could It Help With Weight Management? Wellness Hub If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy.