Skip to content
Current Dispatch Times: Normal [Same Day Before 3pm EST]
Current Dispatch Times: Normal [Same Day Before 3pm EST]

Serious Mass

45 reviews
$89.99 CAD

Product Info

High-Calorie Weight Gainer

Although many people traditionally try to lose weight, there are several instances when gaining weight is equally as desired. For a healthy and nutritious way to increase the number on the scale, there are few products better than Serious Mass by Optimum Nutrition. Whether you need to gain weight for bodybuilding, for a growing teen who can't eat enough to keep their weight sustained, or in response to specific medical ailments, this weight gainer is healthy and delicious.

  • 1,250 calories in each serving
  • 50 grams of blended protein for sustained support
  • More than 250 grams of carbohydrates
  • Minimal to zero added sugar
  • 25 essential vitamins and minerals
  • 12lb container
  • Five delicious flavours

Smart Ingredients

Gaining weight isn't just about eating whatever you want. There is a smart way to pack on the pounds, and Optimum Nutrition is an expert in the essential ingredients you need to support your body's growth. Each serving of Serious Mass contains 1,250 calories, 50 grams of blended protein, and more than 250 grams of carbohydrates with minimal to no added sugars.

Vitamins and Mineral Support

In addition to a delicious formula with an incredible amount of protein, Serious Mass also offers 25 essential vitamins and minerals, including creatine, glutamic acid, and glutamine. Together, the ingredients in Serious Mass help boost your overall calorie intake, fuel extreme workouts and build and maintain muscle. Each serving is two scoops of powder, but Serious Mass's serving size is easy to adjust if necessary!

Fuel your body with Serious Mass by Optimum Nutrition!

Optimum Nutrition Serious Mass Nutrition Facts at Supplement Superstore Canada

Supplement Nutrition Info

12lb / Chocolate

12lb / Vanilla

12lb / Strawberry

12lb / Banana

12lb / Chocolate Peanut Butter


Customer Reviews
4.9 Based on 45 Reviews
5 ?
4 ?
3 ?
2 ?
1 ?
Customer Photos
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
  • service
  • delivery
  • taste
  • weight
  • mass
  • scoop
  • results
  • Everything
  • flavour
  • protein
Ron L.
I recommend this product

Excellent product

Taste great and mixes easily. One rise and the shaker is clean. First try at Serious Mass so I'm looking forward to some gain.

Gerald M.
Canada Canada
I recommend this product

Love this Serious Mass...

Some people have to work to keep weight on, and when you work out you can lose it if you can't eat large amounts of whole food. Serious Mass is for those people, and for me it stops the muscle loss that comes with age. It mixes well and tastes good........I use it right after a workout, a great calorie and protein boost.

Oluwasayo B.
Canada Canada
I recommend this product

Great product!

Product got delivered on time and tastes good. Would order again.

Brandin L.
Canada Canada
I recommend this product

Great product

Serious mass has helped me put on weight, and build muscle each time I've used it and that's why I continue to order it!

Martin S.
Canada Canada
I recommend this product


Super good love that