For accessibility related questions, please contact us or visit our Accessibility Statement.
Skip to content Skip to navigation
15% off your first order when you sign up to our newsletter
Free delivery for orders over $75

SERIOUS MASS

  • For Muscle Building & Weight Gain Goals
  • 1,250 Calories per Serving to Help Boost Calorie Intake ¹
  • 50 Grams of Protein per Serving to Help Build and Maintain Muscle ¹ ³
  • 252-254 Grams of Carbohydrates per Serving to Help Fuel Workouts ¹

Product Overview

For Muscle Building & Weight Gain Goals

SERIOUS MASS is the ultimate muscle building and weight gain formula. With 1,250 calories per 2-scoop serving and 50 grams of protein to support muscle recovery, this powder makes the ideal post-workout and between meals shake for sizing up your goals. SERIOUS MASS provides you with the tools you need to support your weight gains goals.¹

Benefits

  • High-Calorie Formula Supports Muscle Building³ and Weight Gain Goals¹
  • 1,250 Calories per Serving to Help Boost Calorie Intake¹
  • 50 Grams of Protein per Serving to Help Build and Maintain Muscle¹ ³
  • 252-254 Grams of Carbohydrates per Serving to Help Fuel Workouts¹
  • 3 Grams of Creatine Monohydrate per Serving
  • 25 Vitamins & Essential Minerals

Suggested Use

Mix 2 scoops of the powder into 24 fluid ounces of cold water or milk using an electric blender. This allows to you add in fruits, peanut butter and other calorie-contributing foods. TIP: New users should start with a 1-scoop half serving. Use post-workout and/or between meals to add calories, carbs and protein to your healthy, balanced diet.

Nutritional Information

Nutritional information will be shown when a flavour and/or size is selected.

Customer Reviews

419
Overall Rating (4.7)
Write your review here. For complaints and questions we would like to refer you to our customer service.
Please enter a headline
Please enter a comment
Please enter a rating
form.alias.invalid

Optimum mass

Review by Jackie on Mar 30, 2023
Verified purchase
I buy this product for my son. He is 18 and gaining weight in conjunction with weight training. He loves Optimum Mass. Optimum Nutrition offers the bigger bag which is very hard to find. My order always comes in time.

Top

Review by Volodymyr on Mar 12, 2023
Verified purchase
Thank you ! Best product on the market

Great Product

Review by Anonymous on Mar 4, 2023
Great to gain weight really works

Great product

Review by Levin on Feb 17, 2023
Verified purchase
I’ve been using Serious Mass for a month now I can say there has been a difference in my body. More toned and gained muscle too. Still got a long way to go. The taste is okay but I usually mix with peanut butter, banana, milk and water - it taste much better that way.

Vanilla is best

Review by Nikki on Feb 16, 2023
Verified purchase
Vanilla is best. Not much to say. I’ve tried them and vanilla is the best

Great mass gainer

Review by Slawomir on Feb 3, 2023
Verified purchase
Great mass gainer

as always be optimistic with any product

Review by Tommy on Feb 3, 2023
I bought this to gain mass. It has done me well, I mix it with frozen fruit, cinnamon, and granola.

All is well

Review by Anonymous on Jan 20, 2023
Verified purchase
Gains are on the way. Great for recovery. Chocolate flavour is tastes great. Will get another. Thanks ON.

Great stuff!

Review by Bradley on Jan 11, 2023
Verified purchase
Definitely getting another one

Great stuff!

Review by Bradley on Jan 11, 2023
Verified purchase
Definitely buying another one!

Sign up for weekly offers, news and advice

Plus 15% off your first order