L Carnitine Benefits for Male Erectile Dysfunction: What the Evidence Shows Glycine Propionyl L Carnitine & ED : Benefits, Effects & Uses Allo Health Blog 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 Carnitine traffic and human fertility ScienceDirect