What is carnitine? Carnitine is produced in the body from the amino acid lysine and naturally occurs in some foods. It supports energy metabolism and muscle function, which are important factors in How Much L Carnitine Per Day: Expert Guide The Science of Good Health Should I use L Carnitine on rest days or just before workouts? What Is L Carnitine? L Carnitine Benefits, Dosage & When To take? MYPROTEIN