Precision formula Mass Maker takes the category of high quality weight gainers to a new level. Mass Maker features the scientifically advanced Tri-Phase carbohydrate system-an unparalleled high-octane carb source for performance athletes and bodybuilders. Advanced Tri-Phase is comprised of two proven complex carbohydrate sources: corn (maltodextrin) and rice, and one unbelievably sophisticated fibrous carbohydrate with a 10-hour release time.