is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Click here to read our full disclaimer.

So you are trying to add a lot of muscle but having trouble? First things first, you need to be consuming a lot of calories. And within those calories, needs to be a lot of protein. Still not sure what to do? Look no further than Optimum Nutrition Serious Mass. Serious Mass is a mass gainer that is packed with calories, carbs, and protein. It is the perfect supplement for someone who wants some serious gains.

Optimum Nutrition Serious Mass is a formulation perfect for someone who is struggling to consume a surplus of calories to build muscle. It is also great for those on the go and may not have time to fully prepare their meals. This mass gainer packs 1,250 calories per serving which would help anyone meet or exceed their calorie goal for the day.

Nutrition Facts

Optimum Nutrition Serious Mass gainer contains many different ingredients. Serious Mass contains 1250 calories per serving as well as 255 grams of carbohydrates and 3 grams of total fat. It contains over 25 different vitamins and minerals and also has 500mg of glutamine. This product also has the added benefit of 3 grams of creatine that will help increase your muscle gains. Serious Mass includes a protein blend which means the protein comes from different sources including whey protein concentrate, calcium caseinate, egg whites, and sweet whey. This supplement also contains 20 grams of sugar per serving as well.

Mixability and Taste

The directions for ON Serious Mass state that you need to mix 2 heaping scoops of the powder with 24 ounces of cold water or milk and then blend and mix for 30-45 seconds. By following those directions, you get a thick and creamy protein drink with a milkshake like consistency. It mixes very well and comes in a variety of flavors. ON offers Banana, Chocolate, Chocolate Peanut Butter, Cookies and Cream, Strawberry, and Vanilla as flavors. The Cookies and Cream flavor is tasty and delicious. Here is a pro tip: If you want to add even more calories, consider adding peanut butter, fruit or nuts to your shake.


  • Lots of proteins
  • Lots of calories
  • Delicious taste


  • Contains Soy

Optimum Nutrition Serious Mass is a solid choice for someone looking for a mass gainer. This product will help to gain weight and muscle. If you need a boost to your daily calorie and protein intake, then give this product a shot.