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Optimum Nutrition Serious Mass 5.4kg

£77.99 £48.27
(You save £29.72)

Product Description

ON’s Serious Mass is the ultimate weight gain formula. If you find it difficult to gain weight, Serious Mass can help you develop the physique you've always wanted! Without adequate calories and quality protein, you simply can’t get any bigger, without enough fuel and muscle-building nutrients like protein, you simply won’t grow! Enter Serious Mass...

What Does It Do?
Each delicious shake delivers an incredible 1,250 calories, but no added sugar. This includes 50g of blended protein to support building muscle and 250g of carbs to fuel your workouts. That’s serious calories, serious protein and serious carbs...that’s Serious Mass!

Nutritional Information

Container Size: 5455g 
Serving Size: 2 scoops (334g) 
Servings Per Container: 16
Amount Per Serving: 

Total Calories: 1250 
Protein: 50g 
Total Carbohydrates: 252g 
-Sugars: 20g 
-Dietary Fiber: 4g 
Fat: 4.5g 
-Saturates: 1.5g 
Cholesterol: 80mg 
Vitamin A: 5000 I.U. 
Vitamin C: 60mg 
Vitamin D: 200 I.U. 
Vitamin E: 30 I.U.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 
Choline (as choline bitartrate): 250mg 
Inositol: 250mg 
PABA: 5mg 
Creatine Monohydrate: 1g 
L-Glutamine: 500mg 
Glutamine Peptides: 500mg


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, Selenomethionine, 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 

Please Note: Nutritional facts and ingredients may vary slightly between flavours


Add 2 heaped scoops of Serious Mass™ to a blender filled with 710ml (24oz) of water. Blend for 45-60 seconds, then add a few ice cubes and, if desired, calorie-contributing ingredients.

Tips: Mixing 2 scoops of Serious Mass™ with 710ml (24oz) of skimmed or semi-skimmed milk will give you a thicker, creamier, higher-calorie shake. New users may find it beneficial to begin with ½ of a serving daily for the first week, and then gradually increase to 1 or more full servings several times a day.

Serious Mass™ can be used to feed serious calorie needs in a variety of different ways.

Between Meals: Drink ½ - 1 serving of Serious Mass™ between meals to support a high calorie diet.

Post-Workout: Begin drinking ½ - 1 serving of Serious Mass™ 30-45 minutes following exercise.

Before Bed: Drink ½ - 1 serving of Serious Mass™ about 45-60 minutes before bed to provide nutrients to muscles throughout the night.

For best results, use Serious Mass™ combined with intense weight training (3-5 times per week) and a sensible, whole foods diet.

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