Skip to product information
Mutant Mass Gainer Chocolate Fudge Brownie for muscle building in a product image
1/9

Mutant Mass

Sale price  £29.99 Regular price  £32.49
Free Delivery When You Spend £100
00
Hours
00
Mins
00
Secs
FOR SAME DAY DISPATCH
  • Pack on serious size faster with a high‑calorie mass gainer built for hardgainers and bulk phases.
  • Multi‑source protein feeds muscles for hours to support growth and recovery after intense training.
  • Food‑based, nutrient‑dense carbs deliver sustained energy and help refill glycogen stores.
  • Thick, milkshake‑style taste that mixes easily—effortless extra calories between meals or post‑workout.
  • Trusted since 2005 with millions of servings worldwide—proven results and outstanding value per bag.

Mutant Mass — The Original Big Bag Gainer for Relentless Size

If you struggle to eat enough to grow, Mutant Mass does the heavy lifting for you. This is the legendary mass gainer trusted by lifters and athletes across the globe since 2005—rebuilt to be even better. Designed for the strong, the hungry, and the truly dedicated, Mutant Mass delivers a powerful hit of calories from clean, food‑based sources to help you move the scale, fill out your frame, and recover harder between sessions.

Why Mutant Mass Works

Calorie surplus made simple: Building size requires more calories than you burn. Mutant Mass makes hitting that surplus easy with a dense, satisfying shake you can drink any time you can’t face another plate of food.

Multi‑phase protein support: A blend of fast and sustained‑release proteins helps feed muscles for longer—ideal after brutal workouts and during busy days when meal timing isn’t perfect.

Real food carbs for real performance: A focus on nutrient‑dense carbohydrates helps fuel training, drive recovery, and support fuller, harder muscles.

Smart calories, serious flavour: Thick, creamy, and genuinely enjoyable—so you’ll actually stay consistent. Mixes well with water or milk and stacks easily with your favourite supplements.

Who It’s For

  • Hardgainers who need an easy way to increase daily calories and protein.
  • Bodybuilders and strength athletes in off‑season or bulk phases.
  • Busy trainees who want a convenient, nutrient‑dense meal alternative on the go.

How to Use for Best Results

  • Have a serving between meals to drive up daily calories without feeling stuffed.
  • Use after training to support recovery and muscle growth.
  • Adjust serving size to your goals: start smaller and build up as your appetite allows.

What Sets It Apart

  • Proven pedigree: Millions of servings in 100+ countries—Mutant Mass is a gainer with a track record.
  • Food‑first formula: Built around nutrient‑dense, clean ingredients, not empty calories.
  • Great value per serving: Big bag, big gains—ideal for long bulks and high‑output training blocks.

Stack It

Pair Mutant Mass with creatine, essential fatty acids, and a solid training plan for a complete mass‑building stack. Consistency is everything—train hard, eat big, sleep deep, repeat.

WE ARE MUTANT. When it’s time to leave average behind, grab the original big bag gainer and go build something monstrous.

Calories 1100kcal kcal
0%
RDI
Protein 56g g
100%
RDI
Fat 12g g
0%
RDI
Sat Fat 6g g
0%
RDI
Salt 0 g
0%
RDI
Carbs 192g g
0%
RDI
Values per serving
Please note that this information may be subject to change.
For the most accurate and up-to-date details, please refer to the product packaging.

Serving Size

280g

Expiry

2.27kg / Chocolate Fudge Brownie 11-02-2028
2.27kg / Strawberry Banana 24-03-2028
2.27kg / Triple Chocolate 01-04-2028
6.8kg / Chocolate Fudge Brownie 10-04-2028
6.8kg / Cookies & Cream 08-10-2027
6.8kg / Strawberry Banana 09-04-2028
6.8kg / Triple Chocolate 03-04-2028

Barcodes

2.27kg / Chocolate Fudge Brownie 627933026626
2.27kg / Cookies & Cream 627933026800
2.27kg / Strawberry Banana 627933026695
2.27kg / Triple Chocolate 627933026664
6.8kg / Chocolate Fudge Brownie 627933026954
6.8kg / Cookies & Cream 627933026817
6.8kg / Strawberry Banana 627933026572
6.8kg / Triple Chocolate 627933026565

Directions

Add 750-1000 ml (~24-32 fl oz) of water to a blender or large shaker cup, then add 4 scoops of MUTANT MASS, blend or shake for 20-30 seconds. Tastes amazing in water - Tastes even better in milk! Always add liquid first then add MUTANT MASS. Use anytime you want to fill a nutritional gap that requires a premium blend of protein, carbs and calories.

Warnings

Read entire label before using, Intended to be used as a food supplement only by healthy adults. Not recommended for children or pregnant or nursing woman. Do not exceed the recommended dose. This product is intended to be used to supplement the diet. This product is not to be used as substitute for a varied diet. A varied and balanced diet or exercise and healthy lifestyle are essential for good health. Consult a physician before starting any diet or exercise program, and before using this product if you have any ailments, conditions or if you have any product, ingredient or health concerns. Packed by weight, not by volume. Setting of powder occurs after packaging. Do not use if bag is torn, broken or open. Keep out of direct sunlight and store in a cool, dark place. Keep sealed when not in use, and out of reach of children. The tryptophan in this product is naturally occurring. Values are approximate and are subject too natural variation.

Ingredients

  • Waxy Maize
  • Maltodextrin
  • Fructose
  • Dextrose
  • Corn Solids
  • Whey Protein Concentrate and Protein Matrix [Whey Protein Concentrates
  • Micellar Casein
  • Milk Protein concentrate
  • Calcium Caseinate
  • Egg White Albumen Protein
  • Whey Protein Isolate
  • Milk Protein Isolate
  • Whey Protein Hydrolysate]
  • Defatted Soybean [fibre source]
  • Cocoa
  • Fractionated Coconut Oil [supplies MCTs (Medium Chain Triglycerides)]
  • Waxy Barley Starch
  • Corn Syrup Solids
  • Flax Seed Powder
  • Glutamine Peptides [from Wheat]
  • Sodium Caseinate
  • Milk Fat Solids
  • Guar Gum
  • Vanillin
  • Inulin [Fibre source from Chicory]
  • Powdered Sunflower Seed Oil [supplies CLA]
  • Colostrum
  • Inositol
  • Cinnamon Extract
  • Sucralose
  • Mono & Diglycerides
  • Dipotassium Phosphate
  • Potassium Citrate
  • Soya Lecithin. Please Note: Nutritional facts and ingredients may vary slightly between flavours Please Note: Nutritional facts and ingredients may vary slightly between flavours.

Customer Reviews

Based on 64 reviews
78%
(50)
11%
(7)
11%
(7)
0%
(0)
0%
(0)
T
Tonyeeee
Tastes good

Cookies and cream tastes good and mixes well. I have it with banana grapes and almond nuts all blended up 🤤 i have 2 scoops twice a day but only on day 2 so not sure if iv put any weight on yet but will see in a week or so 👍🏻

A
Andrew Powell
Great taste

This product really tastes great, but not sure how effective it is.

I have bought 3 of these so far and use them as a post workout supplement. The recommended amount of scoops is 4 scoops which are 1000 calories, but I only take 2 as 1000 calories just sounded a bit much. I haven't lost weight taking it but also haven't gained weight so all I can say is it tastes nice and fills the hole after an intense workout.

T
Tonyeeee
Tastes good

Cookies and cream tastes good and mixes well. I have it with banana grapes and almond nuts all blended up 🤤 i have 2 scoops twice a day but only on day 2 so not sure if iv put any weight on yet but will see in a week or so 👍🏻

M
MGS Customer
Terrible gas…

Tastes fine, does the job. But the stuff gives me really bad gas. My partner very quickly banned me from using it lol

M
Matt
Great product

Great flavour, mix, and value ,

Why Shop With Us?

Experience the difference with our premium service and quality products

EASY TO NAVIGATE

Clear product details so you know exactly what you are getting

Next Day Shipping

Order before 3pm and it could be with you in as little as 24 hours

Fully tracked

With delivery windows so you know when and where your parcel will be delivered

Top Brands

Shop from the best in Gym Supplementation to give you the edge.

Have you seen 👀

Shop Highlights

New Arrivals
New Arrivals

New Arrivals

Best Sellers
Best Sellers

Best Sellers

Protein
Protein

Protein

Pre-Workout
Pre-Workout

Pre-Workout

Best Sellers

View all
Conteh Sports Pre Shred Capsules

Conteh Sports Pre Shred Capsules

Regular price  £29.99 GBP Sale price  £22.49 GBP

Conteh Sports Pre Shred Capsules

Sale price  £22.49 GBP Regular price  £29.99 GBP
Conteh Sports Hydra Flow

Conteh Sports Hydra Flow

Regular price  £29.99 GBP Sale price  £25.99 GBP

Conteh Sports Hydra Flow

Sale price  £25.99 GBP Regular price  £29.99 GBP
Per4m Advanced Whey Protein Sachet

Per4m Advanced Whey Protein Sachet

Regular price  £2.99 GBP Sale price  £2.49 GBP

Per4m Advanced Whey Protein Sachet

Sale price  £2.49 GBP Regular price  £2.99 GBP
Applied Nutrition High Protein Shake

Applied Nutrition High Protein Shake

Regular price  £27.95 GBP Sale price  £16.49 GBP

Applied Nutrition High Protein Shake

Sale price  £16.49 GBP Regular price  £27.95 GBP
Per4m Advanced Whey Protein

Per4m Advanced Whey Protein

Regular price  £37.99 GBP Sale price  £32.99 GBP

Per4m Advanced Whey Protein

Sale price  £32.99 GBP Regular price  £37.99 GBP
Atlas Superweight Gainer 1500

Atlas Superweight Gainer 1500

£16.49 GBP

Atlas Superweight Gainer 1500

£16.49 GBP
Per4m Pump 495g (Glycosize Included)

Per4m Pump 495g (Glycosize Included)

£25.99 GBP

Per4m Pump 495g (Glycosize Included)

£25.99 GBP
Applied Nutrition Sparkling Protein Water

Applied Nutrition Sparkling Protein Water

£22.49 GBP

Applied Nutrition Sparkling Protein Water

£22.49 GBP

My Gym Supplements Reviews & BUying Advice

Latest from Inside the Scoop

Breaking down what’s in your supplements and why it matters