ON’s Serious Mass is formulated for athletes who are serious about packing on quality mass. Each great-tasting serving delivers over 1,250 nutrient packed calories built on a foundation of 50 grams of muscle building protein from high-quality sources including Ultrafiltered Whey Protein Concentrate, Calcium Caseinate, and Egg Albumen. A combination of low glycemic carbohydrates and MCTs will fuel your body with enough energy to carry you through even the most demanding workouts. In addition, Creatine Monohydrate and Glutamine have been added to help optimize each strength-training workout, while a complete Vitamin and Essential Mineral profile insures your body gets the balanced nutrition it needs. Serious Mass is available in three delicious flavors.

Click Here to Read Optimum Nutrition Serious Mass User Reviews