It is likely that some of them have succumbed to the temptation of quick and easy muscles, but Vince argued that the metabolism and testosterone could be increased naturally. In order to accelerate muscle growth, you have to have a sufficient amount of protein to rebuild damaged tissue from extreme workouts. The best source of natural protein in your diet to increase muscle mass is the food you eat, but sometimes that is not enough, and that's why protein Shred T3x are recommended. The best "all in one" protein comes naturally, with little or no additives. glutamine for muscle L-glutamine is another natural supplement. L-glutamine assists the muscles to recover from extenuating efforts.