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Optimum Nutrition Serious Mass

Optimum Nutrition Serious Mass

Regular price $84.90
Regular price Sale price $84.90
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Optimum Nutrition Serious Mass - Fuel Your Weight Gain Goals

Are you looking to build muscle and achieve your weight gain goals? Optimum Nutrition Serious Mass is here to help. With its powerful formula designed to support muscle building and recovery, Serious Mass is the ultimate solution for those seeking to size up their physique and achieve the results they've always wanted.

  • 1,250 calories per serving to fuel your weight gain goals
  • 50 grams of blended protein for muscle recovery support
  • Over 250 grams of carbohydrates with no added sugar for sustained energy
  • Creatine, glutamine, and glutamic acid, along with 25 essential vitamins and minerals for overall health
  • Delicious taste that makes adding calories enjoyable

Adding Calories Has Never Been This Easy or Tasted So Good

Packing in 1,250 calories per serving, Optimum Nutrition Serious Mass provides you with the high-calorie nutrition you need to fuel your body for optimal weight gain. With its instantised powder form, it's easy to mix and enjoy as a post-workout shake or between meals, making it convenient for busy individuals looking to maximize their calorie intake.

Powerhouse of Protein for Muscle Recovery Support

Serious Mass is packed with 50 grams of blended protein per serving, helping to support muscle recovery and growth. The combination of different protein sources ensures a steady and sustained release of amino acids, providing your muscles with the nutrients they need for optimal recovery and growth.

Carbohydrates with No Added Sugar

Carbohydrates are crucial for fueling your workouts and supporting weight gain goals. With over 250 grams of carbohydrates per serving and no added sugar, Optimum Nutrition Serious Mass provides your body with the necessary energy to power through your workouts and support your weight gain journey without the unwanted sugar spike.

Packed with Essential Nutrients for Overall Health

Creatine, Glutamine and Glutamic Acid, 25 Vitamins and Essential Minerals. In addition to its calorie and protein content, Serious Mass also contains important nutrients that support overall health and well-being. With the inclusion of creatine, glutamine, and glutamic acid, as well as 25 essential vitamins and minerals, Serious Mass ensures that your body is fueled with the nutrients it needs to perform at its best and support your weight gain goals.

Taste the Difference

Indulge in the delicious taste of Optimum Nutrition Serious Mass. With its mouthwatering flavor, Serious Mass makes getting in those extra calories a treat for your taste buds, so you can enjoy every sip of your weight gain journey.

How to Use Serious Mass

Mix 2 scoops of Serious Mass with 700 ml of cold water, milk, or beverage of choice.

New users may find it beneficial to begin with 1/2 of a serving daily for the first week and then gradually increase to 1 serving a day. SERIOUS MASS is designed to have serious calories, protein and carbohydrates – making this a convenient way to get extra calories throughout your day.


For orders over $95, we offer FREE postage Australia wide
For orders below $95, the regular postage fee Australia wide is $10
For orders below $95, the express postage fee Australia wide is $14.95


We aim to dispatch all orders within 1-2 days. Once your order is dispatched, you will get an email with a tracking number with a clickable link. Alternatively, you can simply visit AusPost and enter your tracking number.

If your delivery seems to be taking longer than expected, please email us at, and we would be happy to follow it up for you!

We have a 30 Day refund/ return policy. However, please find our full list of terms and conditions here.


Have a full read of our shipping policy here or reach out to us directly.
You can email or buzz us on 02 6290 6635.
Happy shopping Oxygen crew!