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.