It contains 100 percent pure, ultra-premium quality beta-alanine. This means that it can be produced by the body itself, however it does not get produced in the amounts needed to see the best results. It has been used by endurance athletes around the world. It is the only naturally occurring beta amino acid. It works with L-histidine to raise levels of carnosine in skeletal muscle. Huge 500mg of pure beta alanine per capsule. They are ideal for anyone participating in sports that require explosive actions such as sprinting, weight training or boxing and those involved in prolonged endurance exercise. Available in 120 capsules bottle.