L-Citrulline is the combination of the nonessential amino, acid Citrulline and malic acid, which increases resistance even more when citrulline is taken as sole supplement. Furthermore, it is one of the main precursors of adenosin triphosphate, a kind of mitochondrial energy that is perfect for intense workouts; so, extreme energy effect and less fatigue before and during hard workouts. It is also a precursor of nitric oxide which supports a relaxation of capillary vessels and improves muscular congestion and density.