Mass Extreme is the number one product that allows you to quickly and effectively build muscle mass. The product uses the patented formula Pro Active Growth + Massive Testo Activator, whose action has been proved in tests. All the ingredients have been chosen so that together they create a formula that instantly adds energy, lengthens training time, allows you to perform more reps and stimulates the body to build well defined muscle. You will not find another supplement in the market that has such comprehensive action.