Optimum Nutrition Serious Mass

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  • High-calorie supplement formulated with a 1:5 protein to carbohydrate ratio
  • Each serving contains 1,250 calories
  • Each serving contains 50 grams of protein, 253 grams of carbohydrates, 4 grams of fat,
  • Available in Chocolate, Chocolate Peanut Butter, Strawberry, and Vanilla 
  • Recommended to use 2 scoops per 24 ounces of fluid taken post-workout or in between meals
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In-Depth Review

Optimum Nutrition Serious Mass Review (2024): Is This Popular Weight Gainer Worth the Hype?

Optimum Nutrition Serious Mass Review (2024): Is This Popular Weight Gainer Worth the Hype?

In this Optimum Nutrition Serious Mass review, a sports dietitian breaks down the pros and cons of one of the internet’s most popular weight gainers. Read the full review.

Pros & Cons

What we like ...
  • Taste
  • High carb to protein ratio
  • Includes creatine monohydrate
  • Low fat
  • Users report it works quickly
What needs improvement ...
  • Does not mix well without a blender
  • Contains sucralose
  • 20 grams of sugar

Product Summary

If you’re looking for a high-calorie, nutrient-dense mass weight gainer, Optimum Nutrition’s Serious Mass may be a good choice for you. This supplement contains 1,250 calories per serving with 50 grams of protein, 252 to 254 grams of carbs, and less than 5 grams of fat in four flavors: Chocolate, Chocolate Peanut Butter, Strawberry, and Vanilla. Additionally, there are 3 grams of creatine monohydrate, which effectively supports lean muscle growth.

This weight gainer does contain artificial ingredients including sucralose, which may matter to some people. While users appreciate the taste, Serious Mass has 9 grams of added sugar for a total of 20 grams per serving which may be a dealbreaker for some. However, Serious Mass powder is packed with 25 essential vitamins and essential minerals offering micronutrients not always seen in weight gainers.

This product mixes best with cold water or in a blender. While most users find the mixability acceptable, it does leave some lumps if not mixed in a blender. Mix this powder with some added fruit, peanut butter, or supplement of your choice or take it in solo for a serious dose of extra calories.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.



Chocolate, Chocolate Peanut Butter, Strawberry, and Vanilla

Key ingredients

Maltodextrin, protein blend (whey protein concentrate, calcium caseinate, egg white, sweet whey), medium chain triglycerides, lecithin, sucralos

Nutritional highlights

1,250 calories, 50 g protein, 252-254 g carbohydrate, >5 g fat

Serving information

8 servings

GGR Community Reviews

Optimum Nutrition Serious Mass

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      If you do not mind artificial ingredients, Optimum Nutrition Serious Mass is a good-tasting weight gainer with an impressive 1:5 protein to carbohydrate ratio.