Acetyl L Carnitine (ALCAR) Supplement for Horses Mad Barn Nutrex Research Liquid Carnitine 3000, Fat Burner, Rapid Absorption, Maxium Strength, Dietary Supplement 16 fl oz 473ml Lazada Singapore 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 L CARNITINE for fat loss? A quick summary and understanding of this popular but misunderstood supplement L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy.