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1,250 Calories per serving in water; 1,630 Calories when made with low fat milk, 50 Grams protein, 253 Grams of carbohydrates to support fueling of intense workouts and ais in the replenishment of Glycogen Store with no added sugar, Creatine, L-Glutamine & Glutamine Peptides, Choline, Inositol and PABA.


Putting on mass has never been so easy with Optimum Nutrition Serious Mass. This weight gainer powder contains a whopping 1,250 calories per serving, with 2 massive 167g scoops packing 50g of blended protein including Whey Concentrate and Isolates, as well as casein and egg proteins. Plus over 250g of carbohydrates, no added sugar, as well as creatine, glutamine and glutamic acid to support strength and recovery, look no further if you want to take your muscle building to the next level.

Plus with as little as 7g of fat and enhanced with 25 vitamins and minerals, you can forget dirty bulking to increasing your calorie intake, and reach for a tub of Optimum Nutrition Serious Mass instead, to flood your body with muscle building nutrients capable of sky-rocketing your daily intake of proteins and carbohydrates.

Available in Banana, Vanilla, Chocolate and Strawberry, prepare for one of the most delicious and best textured shakes on the market. Don’t forget to mix with low fat milk to step up your calorie game to the next level!


  • Please visit our page Return & refund policy to check if you are eligible.

    If you would like to request a return for a product purchased through Junior Top Nutrition, please contact Us.

  • We offer FREE standard shipping on all orders over $200 (Value of products in cart must total $200 or more). 

    We also offer FREE standard shipping without any minimum spend for Sydney Metro Area and areas around this area. Contact us for more details about shipping areas. 

    Flat Rate Shipping

    • Standard Shipping - For all orders under $200 we offer Standard Shipping Australia wide for just $10.

    • Express Shipping - For orders under 5kg we offer Express Shipping Australia wide starting at $20.

    Standard shipping takes in the Sydney area between 1 to 3 days and outside and Australia wide 3 to 5 days.

    Express Shipping outside Sydney takes between 2 to 4 days.

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