Prime X Factor Okay, so listed here are the list of products that get my check of authorization while the Greatest Muscle Building drugs. The very first off the draw is protein. That is popular by most muscle-builders and with valid reason. It is one of the best Muscle Building supplements, whilst it doesn't always have any mysterious talents. I prefer it for 2 major causes. The foremost is that it is quite easy. In the place of preparing up half a cow, you and some milk can mix some powder and you have an instant, tasty and healthful food.