Citrulline

Citrulline is a by-product of the body’s conversion of the amino acid arginine into nitric oxide (NO). Excess citrulline increases the amount of arginine in the blood, leading to increased NO production. More NO means increased blood flow to muscles during exercise, which allows them to last longer under duress—and produce bigger muscle pumps to weightlifters. Effective clinical dose of Citrulline is at least 40mg per kg body weight.