Levocarnitine, commonly known as L Carnitine, is a naturally occurring compound that the body produces from the amino acids lysine and methionine. It plays a critical role in energy production by transporting fatty Acetyl L Carnitine for Erectile Dysfunction: What the Evidence Shows and How to Use It Practically L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage Acetyl L Carnitine Force Factor Acetyl L Carnitine Mark Hyman, MD