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ON Serious Mass - 2.73kg

SKU# 7644

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Regular Price: £28.18

Special Price £23.49

In stock

  • Buy 2 for £22.90 each and save 3%
  • Buy 4 for £22.55 each and save 5%

Quick Overview

ON Serious Mass is a high calorie mass gainer for those who struggle to put on weight. High in protein and carbohydrates.

Regular Price: £28.18

Special Price £23.49

  • Buy 2 for £22.90 each and save 3%
  • Buy 4 for £22.55 each and save 5%

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You will earn £0.23 Protein Pounds for buying this product


ON Serious Mass - 2.73kg

Serious Mass: the ultimate in weight gain formulas. Serious Mass supplies you with the tools you need to pack on the pounds and develop the physique you've always wanted. Other benefits of supplementing with Optimum Nutrition's Serious Mass include:

  • Adding Calories Has Never Been This Easy or Tasted So Good
  • 1,250 Calories
  • 50 g of Blended Protein
  • Over 250 g of Carbohydrates with no added sugar
  • Enhanced with Creatine, Glutamine, and Glutamine Peptides
  • 25 Vitamins and Essential Minerals
Nutrition Info


Add one serving of ON Serious Mass to your preferred amount of water or milk and shake. For best results consume in between meals, post workout and/or before bed. New users would benefit from starting with half of the recommended serving size.  

Serving Information

Serving Size: 2 scoops (334g) 

Servings per container: 2.73kg = 8 servings 


Maltodextrin, Protein Blend (Whey Protein Concentrate, Calcium Caseinate, Egg Albumen, Sweet Dairy Way), Creatine Monohydrate, L-Glutamine, Glutamine Peptides, Choline (as Choline Bitartrate), Inositol, Paba (Para-Aminobenzoic Acid), Artificial Flavor, Vitamin & Mineral Blend (Di-Potassium Phosphate, Magnesium Aspartate, Di-Calcium Phosphate, Calcium Citrate, Ascorbic Acid, Niacinamide, Zinc Citrate, Beta Carotene, d-Calcium Pantothenate, d-alpha Tocopherol Succinate, Copper Gluconate, Ferrous Fumarate, Manganese Amino Acid Chelate, Thiamin Mononitrate, Pyridoxine Hydrochloride, Riboflavin, Chromium Picolinate, Folic Acid, Biotin, Molybdenum Amino Acid Chelate, Cholecalciferol, Potassium Iodide, Cyanocobalamin), Medium Chain Tri-glycerides, Acesulfame Potassium

Manufactured using equipment that processes products containing Milk, Soy, Egg, Gluten, NutsPeanuts and Shell Fish

For Allergens, please see ingredients in bold

Nutritional Values 

Calories per 334g serving: 1250 

Protein (g) per 334g serving: 50 
Carbohydrates (g) per 334g serving: 252 
    of which sugars (g) per 334g serving: 20 
Fiber (g) per 334g serving: 4
Fat (g) per 334g serving: 4.5
    of which saturates (g) per 334g serving: 1.5
Cholesterol (mg) per 334g serving: 80
Vitamin A (IU) per 334g serving: 5000 
Vitamin C (mg) per 334g serving: 60 
Vitamin D (IU) per 334g serving: 200  
Vitamin E (IU) per 334g serving:  30 
Thiamin (mg) per 334g serving: 4.8
Riboflavin (mg) per 334g serving: 4
Niacin (mg) per 334g serving: 50
Vitamin B6 (mg) per 334g serving: 5
Folic Acid (mcg) per 334g serving: 400
Vitamin B12 (mcg) per 334g serving: 10
Biotin (mcg) per 334g serving: 300
Pantothenic Acid (mg) per 334g serving: 25 
Calcium (mg) per 334g serving: 590
Iron (mg) per 334g serving: 8 
Phosphorus (mg) per 334g serving: 430 
Iodine (mcg) per 334g serving: 150 
Magnesium (mg) per 334g serving: 140 
Zinc (mg) per 334g serving: 15
Selenium (mcg) per 334g serving: 70
Copper (mg) per 334g serving: 1.6
Manganese (mg) per 334g serving: 2 
Chromium (mcg) per 334g serving: 120 
Molybdenum (mcg) per 334g serving: 75 
Sodium (mg) per 334g serving: 410
Potassium (mg) per 334g serving: 1560 
Choline (as choline bitartrate) (mg) per 334g serving: 250
Inositol (mg) per 334g serving:  250 
PABA (mg) per 334g serving: 5
Creatine Monohydrate (g) per 334g serving: 1 
L-Glutamine (mg) per 334g serving: 500
Glutamine Peptides (mg) per 334g serving 500

Please note that nutritional information is based on chocolate flavour and individual flavours may vary.


This product is only intended for use by healthy adults over 18 years of age. Please consult your physician before using this product if you have a pre-existing medical condition, including but not limited to diabetes or hypoglycemia or are taking any prescription or over-the-counter medications. Do not use this product if you are pregnant, expect to become pregnant or are nursing.  

STORAGE AND MAINTENANCE:  Store this product in a cool, dry place.


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