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Serious Mass by Optimum Nutrition

Optimum NutritionSKU: 748927065541

$69.95 $90.95
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Discount applies to same size/flavour selections only


Serious Mass by Optimum Nutrition

Serious Mass by Optimum Nutrition is a high-calorie mass gainer. Gaining enough calories and nutrients can be challenging when relying on whole foods alone - not to mention the stress this can put on the digestive system. Formulated for those who struggle to pack on size, Serious Mass delivers a massive protein hit to bulk up even the fastest metabolism.


  • Huge 50g protein and 250g carbohydrate per serving
  • Added digestive enzymes to encourage metabolism 
  • Fortified with vitamin and mineral blend 
  • Calorie surplus encourages improved athletic performance

Our Thoughts

Serious Mass is one of our favourite mass gainer products. Delicious, convenient, and easy on the digestive system, Serious Mass is the secret to sustainable weight gain. Because it contains a huge range of added vitamins and minerals, Serious Mass also functions as a general health supplement to support the way you look, feel, and perform.

Frequently Asked Questions

Optimum Nutrition Serious Mass is a high calorie mass gainer. This is designed for those who want to pack on big size and struggle eating enough protein and calories to do so. When you have a fast metabolism eating enough to gain weight can be difficult. There’s only so much whole food you can eat and digest. Serious Mass helps you get in more quality nutrients. This is also a nice break for your digestive system being easier to digest than any whole food option.

Two simple things are needed to build muscle: sufficient protein and consuming more calories than you burn.

Each serve of Optimum Nutrition Serious Mass will give you a huge 50g of protein and 250g of carbohydrates, making your daily challenge to increase calories a simple task. Breaking it down simply, each serve contains a whopping 1250 calories.

Seeing as there is so much nutrients packed into each serve, Optimum Nutrition have added extra digestive enzymes help you break down and absorb as many of these nutrients as possible.

Optimum Nutrition Serious Mass also has an added vitamin and mineral blend to assist with digestive health and performing at your best.

How do I use it?
We recommend having 1 serve a day but splitting it into 2 servings. Mix 1/2 serve up in the morning with breakfast and then have the other half post-workout.

Each serving should be mixed up in 400-600ml of water in your Spartansuppz shaker.

Should I take anything else for best results?
If your goal is to increase muscle size and strength we’d recommend taking creatine as well.

Creatine is one of the most proven nutritional supplements on the planet to improve strength, power and increase muscle mass.

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