A weight gainer for those who want to gain muscle & size


Each serving provides 1250 calories, 50 grams of protein from whey, egg and casein, 250-plus grams of carbohydrates and 25 vitamins and minerals with added glutamine and creatine.


Enhanced with creatine, glutamine and glutamine peptides to support maximum gains in strength and recovery

Vitamins and minerals provide the body with balanced nutrition.


For maximum effect, combine the consumption of protein powder with a well-balanced diet and intense physical activity.


No sugar added

Great-tasting and convenient



Add two heaping scoops of Serious Mass™ to a blender filled with 24 oz. of water.

Blend for 45-60 seconds.

Then add a few ice cubes and, if desired, other calorie-contributing ingredients and blend for an additional 30-45 seconds. 


Tips:  Mixing two scoops of Serious Mass™ with 24 oz. of nonfat or low fat milk instead of water will give you a thicker, creamier, higher-calorie shake.


New users may find it beneficial to begin with ½ of a serving daily for the first week and then gradually increase to 1 or more full servings several times a day.


Serious Mass™ is a weight-gain supplement that can be used to feed serious calorie needs in a variety of different ways:-


Between Meals

Drink  ½ - 1 serving of Serious Mass™ between meals to maintain positive nitrogen balance and support a high-calorie diet

Post-Workout:  Begin drinking ½ - 1 serving of Serious Mass™ 30-45 minutes following exercise to support maximum recovery

Before Bed : Drink ½ - 1 serving of Serious Mass™ about 45-60 minutes before bed to provide nutrients to recovering muscle throughout the night


Suggested Use

For healthy adults, consume enough energy from a combination of high quality foods and supplements throughout the day as part of a balanced diet and exercise program.

Optimum Nutrition Serious Mass - Vanilla (6lbs)

SKU: 6100540
  • Optimum Nutrition