Optimum Nutrition Serious Mass


Optimum Nutrition’s Serious Mass product has almost twice the calories per serving compared to its lower-calorie counterpart (#2 on this list).

As with nearly all mass gainers, the calories come primarily from carbs — and this product has over 250 grams per serving.

Here are the facts on one serving (334 grams):

  • Calories: 1,250
  • Protein: 50 grams
  • Protein source: Whey, casein, egg
  • Carbs: 252 grams
  • Fat: 4.5 grams
  • Largest size available: 12 pounds (5.4 kg)
  • Flavors available: Chocolate, Banana, Chocolate Peanut Butter


Serious weight gain requires serious calories. However, those who need the extra calories most often have the toughest time consuming enough of them. For many aspiring to be bigger, a highly-active metabolism, weaker appetite and on-the-run lifestyle can make it a real challenge to consume enough calories through whole foods alone. With Serious Mass™ – Vanilla, you’ve got nothing to lose and lots to gain. We’ve consolidated 1250 calories, 50 grams of protein, 253 grams of carbohydrates, 25 vitamins & minerals, glutamine and creatine into every serving. It’s time to stop thinking small; get serious – Serious Mass™.


  • High protein weight gain powder*
  • 1,250 calories per serving in water; 1,630 calories when made with low fat milk
  • 50g protein
  • 253g of carbohydrates t supporting of intense workouts and aid in the replenishment of intense workouts and aid in the replenishment of glycogen stores* with no added sugar
  • Creatine L-glutamine & glutamine peptides, choline, inositol and PABA
Add two (2) heaping scoops (scoop included) of Serious Mass to a large blender
filled with 24 fl. oz. of cold water or milk.
If desired, add ice and other ingredients (see side panel for suggestions);
cover and blend on high speed for 45-60 seconds – or until thoroughly mixed.
NOTE: New users may find it beneficial to begin with one half (1/2)
of a serving daily for the first week, gradually increasing
to one or more full servings several times a day.
Not for use by those with pre-existing medical conditions or taking any medicatio


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