This substance can be found in the normal diet, but it is never sufficient in this way because the dosage required in the body to promote fat burning and thus provide energy is not sufficient on its own. It is therefore necessary to resort to supplementation. L-carnitine is made up of two essential amino acids: lysine and methionine. In addition, for optimal synthesis, it requires the presence of 3 components in the body: iron, vitamin C and B complex.