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Optimum Nutrition Serious Mass

BONUS Amino Energy Trial Tub
Free with the purchase of any 5.45kg Optimum Nutrition Serious Mass.
While stocks last.

Supports muscle building and weight gaining. More than 1260 kcal per serving to help boost your calorie intake. 50 g protein per serving to help build and maintain muscle. More than 250 g carbohydrates per serving to help support muscle Recovery.


Step 1: Choose your size

2720 g (2.72 kg)
or 4 interest-free payments of $15.74
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5450 g (5.45 kg)
or 4 interest-free payments of $27.49
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Step 2: Choose your options

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or 4 interest-free payments of $15.74
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or 4 interest-free payments of $15.74
Learn more
or 4 interest-free payments of $15.74
Learn more
or 4 interest-free payments of $27.49
Learn more
or 4 interest-free payments of $27.49
Learn more
or 4 interest-free payments of $27.49
Learn more
or 4 interest-free payments of $27.49
Learn more


Serious weight gain requires serious calories. However, those who need the extra calories most often have the toughest time consuming enough of them. For many aspiring to be bigger, a highly active metabolism, weaker appetite and on-the-run lifestyle can make it a real challenge to consume enough calories through whole foods alone. Optimum Nutrition SERIOUS MASS™ is the ultimate in weight gain formulas. With 1,250 calories per serving to boost daily calorie intake, 50g high protein to support muscle growth and repair, over 250g carbohydrates helping support muscle recovery , and now with 3 g added Creatine to support performance per serving, you’ve got nothing to lose and lots to gain. It is time to stop thinking small and get serious – SERIOUS MASS™


Ready to mix powder with protein, carbohydrates, vitamins and minerals, with sweetener.


  • Over 1250 calories per serving
  • 50 g of whey protein
  • 250 g carbs helps support muscle recovery
  • 25 vitamins and minerals
  • 3 g of creatine to support performance
  • Ideal formula to support weight gains
  • Enjoy post work-out and between meals
  • Available in a range of sizes and great tasting flavours


For best results, consume your shake between meals when you need extra calories or after your workout to support your recovery.

Mix 2 heaped scoops with 710 ml of water.

Serving Size: About 2 Heaping Scoops (336 G) Average Quantity Per Serving
Fat4.5 g
  Saturated2.5 g
Cholesterol110 mg
Total Carbohydrate252 g
  Dietary Fibre4 g
  Sugars20 g
    Includes 9 g Added Sugars 
Protein50 g
Vitamin A (as beta-carotene)750 mcg
Vitamin C (as ascorbic acid)60 mg
Vitamin D (as cholecalciferol)5 mcg
Vitamin E (as d-alpha tocopheryl succinate)20 mg
Thiamin (as thiamin mononitrate)4.8 mg
Riboflavin4 mg
Niacin (as niacinamide)50 mg
Vitamin B6 (as pyridoxine hydrochloride)5 mg
Folate (as folic acid)680 mcg DFE (400 mcg folic acid)
Vitamin B12 (as cyanocobalamin)10 mcg
Biotin (as d-biotin)300 mcg
Pantothenic Acid (as d-calcium panthothenate)25 mg
Choline (as choline bitartrate)250 mg
Calcium (as calcium citrate, dicalcium phosphate)600 mg
Iron (as ferrous fumarate)8 mg
Phosphorus (as dicalcium phosphate, dipotassium phosphate590 mg
Iodine (as potassium iodide)53 mcg
Magnesium (as magnesium aspartate)140 mg
Zinc (as zinc citrate)15 mg
Selenium (as selenomethionine)70 mcg
Copper (as copper gluconate)1 mg
Manganese (as magnesium amino acid chelate)2 mg
Chromium (as chromium polynicotinate)120 mcg
Molybdenum (as molybdenum amino acid chelate)75 mcg
Sodium570 mg
Potassium (as dipotassium phosphate)1430 mg
Creatine Monohydrate3 g
L-Glutamine500 mg
Inositol250 mg
PABA (para-aminobenzoic acid)5 mg

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