ATP Science has delivered another high-quality product in its amino range. L-Citrulline Malate is a non-essential amino acid (meaning your body can produce it in small amounts - we still think it's essential for THOSE PUMPS THO!). Citrulline works by increasing the blood serum levels of Arginine (another amino acid) which in turn drives Nitric Oxide (NO2) production, which results in increased blood flow working muscles, also known as MADPUMPSBRO. Additionally, in clinical trials, Citrulline Malate has also been shown to improve endurance and muscular strength. ATP Science L-Citrulline Malate is GMO-free as well as being free from gluten and sugar.