The new, scientifically superior MASS-TECH EXTREME 2000 formula delivers over 2,000 calories (when mixed with 20 oz. of skim milk) and delivers high-quality whey protein and easy-to-digest complex carbohydrates. In a university study, subjects consuming 2,000 calories in addition to a high-protein diet and a weightlifting program gained 6.8 lbs. of mass (vs. 1.3 lbs. in the control group). This formula is so powerful you only need one serving a day! Check out the study Rozenek et al., 2002. Journal of Sports Medicine and Physical Fitness. 42(3):340-7.