Amino acids are the building blocks of protein. They make up 1/3 of muscle tissue. BCAAs (Leucine, Isoleucine, Valine) are essential amino acids that cannot be manufactured by the body and so it's necessary to consume them through food or supplementation. Unlike other amino acids they are metabolised in the muscle instead of the liver so the muscle can quickly utilise them as fuel when training. Hydrolysed Whey Protein Isolate (pre-digested) – provides a complete amino acid profile, known to stimulate muscle protein synthesis, facilitate rapid absorption & an improved insulin response. Citrulline Malate – metabolite of Arginine that supports the reduction of muscle fatigue, increase aerobic endurance and improve blood circulation. BCAAs + Citrulline Malate are known for their anabolic and anti-catabolic properties. Provides over 7,000mg of BCAAs in a 4;1;1 ratio per serving.Includes 5,000mg of Leucine and 1,000mg of Citrulline Malate per serving. Contains Optipep Hydrolysed Whey Protein Isolate - the most advanced and purest source of whey protein ( low fat, low lactose) broken down into di and tri peptides & derived from Irish grass fed, hormone free cow’s milk. Provides all 9 essential amino acids that the body cannot manufacture.