Carnitine is an amino acid composite that is made from lysine and methionine. Carnitine benefits energy levels by transporting fatty acids into the mitochondria where they can be burned up and used as fuel. For this reason, many take Carnitine as a weight loss supplement to help bump up fat burning.

L-Carnitine supplements are used to increase L-Carnitine levels in people whose natural level of L-Carnitine is too low because they have a genetic disorder, are taking certain drugs, or because they are undergoing a medical procedure that uses up the body's L-Carnitine.