This product is a fully modern interpretation of a weight gainer product. Mass Complex 900 is a high calorie delicious tasting mass gaining formula featuring time released carbohydrates and protein. After the glycogen restoring maltodextrin and the quick acting whey isolate have assimilated, the hydrolyzed oats and egg protein continue protein synthesis for three hours. This formula is the ultimate for hard gainers or people involved in strenuous endurance training or demanding physical jobs who need a lot of calories.