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  • Ideal Formula to Support Weight Gains
  • 1,250 Calories per Serving to Help Support a Calorie Surplus
  • 50 Grams of Blended Protein per Serving to Help Build and Maintain Muscle
  • 252-254 Grams of Carbohydrates (with no added sugar) to Help Fuel Workouts
  • 3g Creatine Monohydrate with added Creatine

Product Overview


To gain weight, you need to consume more calories than you expend. For many aspiring to hit their calorie goals and put on size, a highly active metabolism, weak appetite or on-the-go lifestyle can make it a real challenge to get enough calories from food alone.
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.


  • Training longer and harder to gain more muscle
  • Finding it difficult to consume enough calories through food alone
  • Finding it challenging to gain weight regardless of your dietary intake.

Serious Mass provides you with all the tools you’ll need to pack on the pounds.


  • 1,250 Calories per Serving to Help Support a Calorie Surplus for Weight Gain and Muscle Building

  • 50 Grams of Blended Protein per Serving to Help Build and Maintain Muscle
  • 252-254 Grams of Carbohydrates (with no added sugar) to Help Fuel Workouts and Aid in Replenishment of Glycogen Stores
  • 3g Creatine Monohydrate To Support Muscle Strength, Power And Size When Combined With High-Intensity Activities
  • 20 Additional Vitamins and Minerals (including L- Glutamine)
  • Ideal Formula to Support Weight Gains
  • Available in a Range of Sizes and Great Tasting Flavours
  • Enjoy Post Work-out and Between Meals

Suggested Use

Mix 2 scoops of the powder into 700-720ml 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

Overall Rating (4.8)
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Good Product

Review by Anonymous on Nov 8, 2023
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Little high in sugar but gets the job done if consistent.

Great Product

Review by Diz on Oct 29, 2023
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i love the way it taste, also its been helping with my recovery after workouts and hitting my weight goals!!

It works

Review by Hitesh Patel on Oct 4, 2023
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I have been using this product for over a year now and it’s really effective when it comes to my weight gain goals and gym strength/muscle mass.


Review by Anonymous on Oct 1, 2023
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Using it for 3mths now. Consistence in taste and results

Amazing if your trying to get extra calories!!

Review by Wyatt on Sept 25, 2023
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Especially for a faster metabolism this really helps on getting the extra calories you need

Best protein powder

Review by Anonymous on Sept 22, 2023
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ON has the best products and their mass gainer has helped me tremendously

First Experience

Review by James on Sept 19, 2023
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I have been super skinny my entire life. I've never been able to gain any weight. I'm what they call a hard gainer. I'm now 64. As we age, men start to lose muscle mass, which can lead to a number of health issues affecting bone density and osteoporosis, which can be offset through weight training. At the recommendation of a friend, he suggested I should try Serious Mass in order to bulk up and add some muscle weight. I first tried mixing it with water, but I didn't like the taste. However, on the second round, I mixed it with lowfat milk, which was a real game changer. It really tastes like a milkshake. I started out with a half serving, as they advise, working up to a full two scoop shake. So far, I've put on six pounds, and I couldn't be happier. I'm working with a personal trainer who is helping me build strength for the long run. It's never too late to build a body that you love.

Greatest product

Review by Nik on Aug 18, 2023
Verified purchase
Love it and use it daily to maintain weight in my extremely active lifestyle

Improved !

Review by M.G on Aug 10, 2023
Verified purchase
I can tell , they have made the MASS PROTEIN much easier to dilute on a shaker bottle. Previously you would get a lump here and there while shaking. Really happy and satisfied with the protein . It’s lighter but heavier on the training. Hands down , best protein powder on the MARKET !


Review by Anonymous on Aug 10, 2023
Verified purchase
Quality, delivery - 💯