Serious Mass
Optimum Nutrition

Serious Mass

High Energy Protein Powder Contributing to Muscle Growth
Loaded with 1258 kcal, 250g of Carbs, & 25 Vitamins and Minerals
8.6  out of 10  (1,095 Reviews)
2 Sizes
2.73 Kilograms
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4 Flavors
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Price: £26.99  (£3.37 / Serving)
Flavor Rating: 7.9
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Product Overview

What is serious mass?

Serious Mass is the ultimate weight gain formula.* With 1,250 calories per serving and 50 grams of protein for muscle recovery, this instantized powder makes a sizable post-workout and between meals shake.* Serious Mass gives you the tools you need to pack on pounds and - when coupled with serious weight training - develop your physique to the fullest.*


  • Adding Calories Has Never Been This Easy or Tasted So Good
  • 1,250 Calories
  • 50 Grams of Blended Protein
  • Over 250 Grams of Carbohydrates with No Added Sugar
  • Enhanced with Creatine, Glutamine, and Glutamic Acid
  • 25 Vitamins and Essential Minerals

How is it different from other gainers?

serious mass - weight gain formula - 50g of protein. pro complex gainer - lean gain formula - 60g of protein.














Ratings & Reviews

Overall Rating
1,095 Ratings
Verified Buyer Rating
414 Ratings
Average Flavor Rating
7 Flavors
Top Rated Flavor
Chocolate Peanut Butter
By clicking the button above, you agree to entering the Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
  • 10 Chocolate
  • 10 Chocolate Peanut Butter
  • 10 Banana
  • 2 Strawberry
  • 9 Chocolate

gain 8 kg in 4 week

  • 10 Chocolate Peanut Butter

Best tasting protein.

  • 10 Banana

Omg! My first time using protein shakes and my first time using it made me felt like an adrenaline rush. This was good now I'm looking forward to some post workout drinks

Verified Buyer
  • 1 Chocolate Peanut Butter

Found a huge bug inside the bag. never felt more disgusted

Verified Buyer
  • 10 Chocolate Peanut Butter

It’s a promise

  • 1 Chocolate
Verified Buyer
  • 10 Chocolate Peanut Butter

Used to use about a year ago to put on some size, gained roughly 5 lbs in my training routines and have purchased more. Looking forward to my next order of Serious Mass.

Verified Buyer
  • 10 Chocolate
  • 9 Chocolate Peanut Butter
  • 9 Banana

Excellent product, does exactly what it says on the tin. Tried the chocolate, chocolate peanut butter and banana. Taste wise chocolate is my favorite but all those 3 taste good. Gives plenty of energy, protein and vitamins/minerals. Can't say I've tried any of the other brands but I don't need to as this does exactly what I need, great stuff even if a bit pricey.

Verified Buyer
  • 10 Chocolate Peanut Butter

This product taste very good and it did it job. I would recommend this product if you wanna put some serious mass on.

Verified Buyer
  • 8 Vanilla

Flavor not bad this product along with weight training help me gain 9lbs in 1 month

Verified Buyer

Been using this for two years, Helped me gain 15 lbs. Not a big guy so I needed to increase weight in order to lift more. Great flavor. I add peanut butter and banana to two scoops and use vit d milk instead of water.

  • 1 Vanilla
Verified Buyer
  • 10 Banana

I bought the banana flavor to consume while in recovery from my tonsillectomy. I think it tastes simply amazing! The product does not feel too thick or heavy. I can easily drink a whole serving in one sitting and enjoy it, and it pretty much covers my hunger for the next few hours. The only complaint I had was that the packaging came damaged and leaking. However, the product and flavor were so good that this was a non-issue for me.

Verified Buyer
  • 10 Chocolate

This stuff is the best mass gainer out right now. Has all the vitamins and minerals you need in a daily diet and helped me gain 15 pounds!

2.73 Kilograms
2.73 Kilograms
8 Servings | £3.37 Per Serving
5.45 Kilograms
5.45 Kilograms
16 Servings | £2.81 Per Serving

What's in Optimum Nutrition Serious Mass

6 Lbs. Banana
Supplement Facts
Serving Size2Scoops(334g)
Servings Per Container8
Per 334g
Energy 5273kJ
Protein 53.1g
Total Carbohydrate 251.4g
Of Which Sugars 29.7g
Total Fat 4.4g
Of Which Saturates 1.3g
Of Which Trans Fat 0g
Dietary Fiber 0g
Sodium 605mg
Vitamin A 299.3mcg
Vitamin D 1.9mcg
Vitamin E 3.5mg
Vitamin C 21.9mg
Thiamin (Vitamin B1) 0.5mg
Riboflavin (Vitamin B2) 0.6mg
Niacin (Vitamin B3) 6.7mg
Vitamin B6 0.7mg
Folic Acid 71.3mcg
Vitamin B12 0.5mcg
Biotin 54.8mcg
Pantothenic Acid (Vitamin B5) 2.1mg
Potassium 1,229mg
Chloride 649mg
Calcium 556.2mg
Phosphorus 190.7mg
Magnesium 74.1mg
Iron 4.3mg
Zinc 4.8mg
Copper 0.6mg
Manganese 0.7mg
Selenium 26.8mcg
Chromium 130.4mcg
Iodine 66mcg
Creatine Monohydrate 1g
L-Glutamine 501mg
Glutamine Peptides 501mg
Choline Bitartrate 607.9mg
Inositol 250.5mg
Maltodextrin, Protein Blend (Whey Protein Concentrate*, Calcium Caseinate*, Egg Albumen), Flavorings, Mineral Blend (Di-Potassium Phosphate, Sodium Chloride, Ferric Pryophosphate, Zinc Oxide, Copper Gluconate, Manganese Sulfate, Chromium Chloride Hexahydrate, Potassium Iodide), Whey Powder*, Medium Chain Triglycerides, Creatine Monohydrate, Color (Curcumin), Choline Bitartrate, L-Glutamine, Glutamine Peptides, Acidity Regulator (Malic Acid),, Inositol, Vitamin Blend (Dextrose Monohydrate, Ascorbic Acid, Vitamin E Acetate, Niacinamide, Biotin, Vitamin A Acetate, Calcium-D-Pantothenate, Pyridoxine Hydrochloride, Folic Acid, Cholecalciferol, Thiamin Hydrochloride, Riboflavin, Cobalamin), Sweetener (Sucralose).
* From Milk
Allergen Information:
Contains Milk, Egg, Wheat (Gluten)

Directions For Serious Mass:

Add two heaping scoops of Serious Mass to a blender filled with 24 oz (710 mL) of water. Blend for 45-60 seconds. Then add a few ice cubes and, if desired, other calorie-contributing ingredients and blend for an additional 30-45 seconds.

Tips: Mixing two scoops of Serious Mass with 24 oz (710 mL) of nonfat or low fat milk instead of water will give you a thicker, creamier, higher-calorie shake. New users may find if beneficial to begin with 1/2 of a serving daily for the first week and then gradually increase to 1 or more full servings several times a day.

Serious Mass is a substantial weight-management supplement that can be used to feed serious calorie needs in a variety of different ways.

Between Meals: Drink 1/2-1 serving of Serious Mass between meals to maintain and support muscle growth as well as contributing to a high-calorie diet.

Post-Workout: Begin drinking 1/2-1 serving of Serious Mass 30-45 minutes following exercise to support muscle growth. Before Bed: Drink 1/2-1 serving of Serious Mass about 45-60 minutes before bed to provide nutrients to help maintain 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.

Warnings: Do not exceed the recommended daily dose. Keep out of reach of children. Do not take this product if you are pregnant or nursing a baby. Check with a qualified healthcare professional before using this product if you are under 18 years of age or if you have any known or suspected medical condition(s) including diabetes, hypoglycemia, and/or if you are taking any prescription or OTC medication(s). Food supplements should not be used as a substitute for a varied diet. Store in a cool, dry place.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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