Optimum Nutrition

Optimum Nutrition Serious Mass 6lb

$69.95 $59.95
or 4 interest free payments of $14.99 with oxipay
Learn more
In stock
Free delivery
Rated 8.8 / 10 2 Reviews

Optimum Nutrition Serious Mass is the ultimate weight gain protein formula that supplies hardgainers, & ectomorphs, with the calories needed to pack on pounds of quality muscle, to develop a strong, solid and muscular physique.

Every serve of Optimum Nutrition Serious Mass delivers over 1’250 of nutrient loaded calories, that are blended with 50g of anabolic (muscle building) protein, from quality proteins such as ultra-filtered whey protein concentrate, calcium caseinate, and egg albumen.

Optimum Nutrition Serious Mass 6lb

More Views

* Required Fields

$69.95 $59.95


  • Serious Weight Gain Protein Formula
  • 1,250 calories per serve
  • 50g Protein-High Protein
  • 25 Vitamins & Minerals + Creatine & Glutamine
  • 250g + of carbohydrates
  • No added Sugar
  • Muscle Building / Build Muscle
  • Strength Gains


Many athletes who are aiming to put on muscle size, tend to either have high metabolisms, weak appetites, or have on the run lifestyles, that make consuming sufficient calories through food alone, a challenge. Serious Mass provides 1’250 calories per serve, which adds plenty of clean calories to a hard-gainers diet.

Between Meals: Drink 1/2-1 serving of Serious Mass between meals to maintain positive nitrogen balance and support a high-calorie diet. Post-Workout: Begin drinking 1/2-1 serving of Serious Mass 30-45 minutes following exercise to support maximum recovery. Before Bed: Drink 1/2-1 serving of Serious Mass about 45-60 minutes before bed to provide nutrients to recovering muscle throughout the night.


Note: For best results use Serious Mass combined with intense weight training (3-5 times per week) and a sensible whole foods diet. Also, keep in mind that sufficient recovery between workouts impacts your ability to gain lean mass. Allowing at least 48 hours between workouts involving the same body parts is recommended.


Supplement Facts
Serving Size: 2 Scoops (334g)
Servings Per Container: 16
Amount Per Serving
Calories 1250
- Calories From Fat 40
Total Fat 4.5g
- Saturated Fat 1.5g
Cholesterol 80mg
Total Carbohydrate 252g
- Dietary Fiber 4g
- Sugars 20g
Protein 50g

Vitamin A 5000IU
Vitamin C 60mg
Vitamin D 200IU
Vitamin E 30IU
Thiamin 4.8mg
Riboflavin 4mg
Niacin 50mg
Vitamin B6 5mg
Folic Acid 400mcg
Vitamin B12 10mcg
Biotin 300mcg
Pantothenic Acid 25mg
Calcium 590mg
Iron 8mg
Phosphorus 430mg
Iodine 150mcg
Magnesium 140mg
Zinc 15mg
Selenium 70mcg
Copper 1.6mg
Manganese 2mg
Chromium 120mcg
Molybdenum 75mcg
Sodium 410mg
Potassium 1560mg

Creatine Monohydrate 1g
L-Glutamine 500mg
Glutamine Peptides 500mg
Choline (as choline bitartrate) 250mg
Inositol 250mg
PABA (para-aminobenzoic acid) 5mg

IMPORTANT: Always check with a Health Professional before using any supplements. Especially if you are under 18 years of age, have any known or suspected medical conditions and/or are taking any prescriptions or medications. Always read the entire label prior to using. Never exceed the recommended dosage.

Optimum Nutrition Serious Mass review by maor1k1d
  • Flavour
  • Formula
  • Effectiveness

I used this in conjunction with a high calorie diet while I was trying to pack on some quality size. Being a hard gainer, even eating a tonne of food didn't do too much for me. So with O.N. Serious Mass I was blown away by the quality of the calories. Most weight gainers i've tried previously have an extremely sugary taste, or have an odd paste taste. O.N. was leaning more towards the paste side, but still I was able to enjoy the flavour. It might just be that I don't like to use too much liquid, i'd rather a smaller, thicker drink, than a smooth, but twice as much gainer. Along with the extra calories I was trying to consume with my high activity job at the time, it just made for easy calories when it wasn't viable to sit down for 30 min and eat a protein/carbs/fats meal. I'd definitely recommend this to anybody trying to put some size on without having to drink pure sugar for 20 minutes.

Optimum Nutrition Serious Mass review by Aprilia
  • Overall
  • Flavour
  • Formula
  • Effectiveness

I have tried the ON Serious Mass chocolate and vanilla flavours. The vanilla is by far the best. It mixes reasonable easily and the vanilla is a great flavour to blend with fresh fruit. The formula has a comprehensive list of supplements added - vitamins, amino acids and minerals. By far the most comprehensive of any mass gainer. I have tried this as well as Mutant Mass (still have half a bag of MM left - terrible taste). You will gain weight on this product. I use it as a meal replacement by blending with fresh fruit, yoghurt, yakult, non-fat milk and coconut water. Like the effect of a lot of these supplements, you might get diarrhea.