L-Citrulline is a non-essential amino acid. It has numerous health and athletic performance benefits. Like L-arginine and L-ornithine, L-citruline is an important intermediate in the urea cycle. The three amino acids function together to get rid of the ammonia, a toxic byproduct of protein metabolism, from body. Since L-citrulline is a precursor of L-arginine, which in turn, can be used for the production of Nitric Oxide (ON). Nitric oxide enhances blood flow and gives better delivery of oxygen and nutrients to working muscle.