*Nature’s Velvet L-Citrulline DL Malate Powder is an amino acid and a precursor to arginine, which dilates blood vessels and increases blood and oxygen flow throughout the body. Citrulline malate powder includes a compound called malic acid, which is found in many fruits and vegetables and may increase energy. This supplement includes a 2:1 ratio of citrulline and malate. Citrulline also plays an important role in the healing process and in the maintenance of a healthy immune system. Enhances Human Physique during intense strength training, lactic acid builds up in your muscles and causes that characteristic muscle burn that slows you down. But citrulline reduces ammonia and lactic acid buildup in the body, meaning you may be able to work out harder and longer.