Serious mass gains require serious amounts of calories and Serious Mass delivers with 1250 calories per dose making your goal of gaining weight much easier!

Very often, those who want to gain weight are those who have the hardest time doing so, due to fast metabolism, weak appetite or busy lifestyles that make it impossible to eat large quantities often.  Serious mass ONfights these difficulties, offering 1250 to 1600 calories per shake, a very high quantity of high quality calories.

To give you an idea, each Serious Mass shake offers:

• 1250 calories if mixed with water or 1600 calories if mixed with milk
• 50 grams of protein from both quickly and slowly digested sources such as whey casein and eggs
• 250 grams of carbohydrates to provide energy for intense workouts and maintain glycogen reserves- without added sugar
• 24 essential vitamins and minerals, with B vitamins and antioxidants
• Fortified with glutamine and creatine

Optimum Serious Mass is the ultimate solution for gaining weight, gaining mass and creating muscle.  Serious Mass is a quality, economical weight gainer from Optimum Nutrition with high quantities of all the necessary ingredients, with reduced sugar and fat.

Its delicious formula allows you to drink shake after shake without getting tired of it.  It's a versatile gainer with smooth flavors that allow you to combine and try out other ingredients and explore new flavors, adding more calories.  Try creating your own premium Gainer adding Serious Mass:

Try and see the results in no time with the best-selling weight gainer in the world!