Category
- HOME
-
BRANDS
- All Brands
- 5% Nutrition Rich Piana
- Alpha Designs
- Alpha Lion
- Alpha Neon
- Animal
- Applied Nutrition
- Axe & Sledge Supplements
- Biotech USA
- BOLD Nutrition
- Boditronics
- BSN
- Cellucor
- Chaos Crew
- CNP
- Dorian Yates
- Dymatize
- Efectiv
- GAT Sport
- Ghost
- Gorillalpha
- Grenade
- Gym Supplements
- Lenny & Larry's
- Little Dragon
- Mars Hi-Protein
- Muscle Moose
- MuscleTech
- Mutant
- Naughty Boy
- Nutramino
- Nutrend
- NXT Nutrition
- Olimp Nutrition
- Optimum Nutrition
- ProSupps
- Redcon1
- Reign
- Sabtec Nutrition
- Scitec Nutrition
- Snickers Hi-Protein
- TWIX Hi-Protein
- TWP Nutrition
- USN
- Uncle Jacks
- Warrior
- SUPPLEMENTS
- FOOD & DRINK
- ACCESSORIES
- BUNDLES
- SALE
-
ARTICLES
- Diet & Weight Loss
- How To Lose Weight & Build Muscle
- Fat Loss - How to make a start to a new you...
- Is Creatine Bad For You?
- Training Program for Weight Loss
- Muscle Gain - A Beginners Guide...
- Training Program for Muscle Gain
- 5 Supplements To Kick Start Your Fitness Journey
- All About Protein - The Beginners Guide
- 5 Best Chest Workouts
Hot Deals
Best Sellers
-
01
Gift Card£10.00
-
02
Applied Nutrition Shaker 700ml£3.99
£4.99
-
03
-
04
Sabtec Nutrition Ashwagandha 640mg 100 caps Exp 2025£5.00
£12.99
Mutant Mass Muscle Mass Gainer 6.8kg
Since 2005, Mutant Mass has been the bag of choice for hardcore bodybuilders and strength athletes who are dead serious about size. Now in its best-ever formula, the 6.8kg bag gives you 26 full servings of over 1,060 engineered calories and 52g of premium protein per shake — enough to fuel weeks of relentless training without running dry.
What sets Mutant Mass apart is the sheer complexity of its formula. The 10-source Pro-Matrix protein blend combines fast, medium, and slow-digesting proteins — whey concentrate, hydrolysate, isolate, micellar casein, milk protein concentrate and isolate — to keep amino acids flowing throughout recovery. The carbohydrate blend draws from Waxy Maize, Maltodextrin, Barley, Sweet Potato and Oat for a sustained energy release, while the lipid blend of MCT Oil, Avocado, Flax, Pumpkin and Sunflower oils adds quality fats rarely seen in mass gainers. Cinnulin PF®, Colostrum, Tart Cherry, L-Glutamine and digestive enzymes complete a formula that’s as much about recovery as it is about calories.
- 1,060 calories | 52g protein per 280g serving
- 10-source Pro-Matrix protein blend — fast, medium & slow release
- Complex carb blend — Waxy Maize, Maltodextrin, Barley, Sweet Potato & Oat
- Premium lipid blend — MCT Oil, Avocado, Flax, Pumpkin & Sunflower
- Cinnulin PF®, Colostrum, Tart Cherry, L-Glutamine & digestive enzymes
- 6.8kg — 26 servings | 5 flavours available
- The original hardcore mass gainer since 2005
Recommended Use:
Add 4 scoops (280g) to 750–1,000ml of water. Always add liquid first. Blend or shake for 20–30 seconds.
Delivery estimates are from the date of dispatch, NOT the date of purchase. All orders are subject to a two days handling time.
We mainly use Royal Mail for all deliveries, however depending on order size and availability, we also use Parcel Force/ DPD as our main courier partners.
We will email confirmation of your order on receipt and for those orders being delivered by a courier company you will receive further delivery update emails via the courier company directly (usually with a delivery slot). Please leave your mobile number at ordering stage if you would like to receive notifications.
Should you not be at home to receive your delivery, our couriers will try again the following day or give you the option to rearrange a delivery time/ collection point.
Should you not be in to sign/ receive your delivery, please let us know via email info@gymsupplements.co.uk and we will arrange to leave your parcel with a neighbour if it is possible to do this.
Should you choose to call, please do not leave a voicemail. Instead, please email us along with your order number.
If you leave a signed authorisation note the couriers will leave your parcel in an alternate place at your delivery address however this will be entirely at your own risk.
Delivery Rates;
- Free Delivery on all orders over £70+
- £4.99 for all orders below £70
While we work hard to ensure all orders are dispatched as quick as possible, sometimes it is out of our hands & even the most reliable couriers can end up having delays.
In this instance, please get in touch with us via email and we will reach out to the courier for an update.
Hot Sellers Right Now
-
-
APS - Mesomorph Pre-Workout (388G) | 25 Servings£45.00
£50.001 review -
-
-
Gas Mark 10 Cream of Rice 2kg£19.99
£23.99 -
-
DY Nutrition Creatine - Creatine Monohydrate 300g£9.99
£19.99 -
Mutant Creatine Monohydrate 300g£9.99
£14.99 -
-
BOLD 3 Months Supply of Creatine Monohydrate Pack£14.99
£39.98 -
BOLD 5 Months Supply of Creatine Monohydrate Pack£19.99
£59.97 -
-
NXT Micronised Creatine£12.99
£14.99 -
DNA Sports Vibe Pre-Workout + Free Shaker£9.99
£17.99 -
Per4m Creatine Monohydrate Sherbet 310g£19.90
£24.99 -
Swole Lifestyle Mayhem Pre Workout 30 Servings£29.99
£34.99 -
Swole Lifestyle Liquid Chalk 250ml£9.99
£12.99 -
-
Sabtec Nutrition Shilajit Resin 30g£24.99
£30.00 -
EHPlabs GhostBusters Oxyshred Cap Black£3.99
£12.99 -
Applied Nutrition Endurance Water Bottle 800ml£3.99
£4.99 -
Strom Sports Peak Max 80 Caps£34.99
£38.99 -
Chaos Crew DIM Estrogen Management 90 Caps£15.99
£19.99 -
Boditronics Just Protein 2000g Expired£24.99
£39.99 -
-
-
BOLD HydroAmino - BCAA, Glutamine & Electrolyte Hydration Powder£19.99
£25.991 review -
BOLD Nutrition Fury Pre Workout 30 Servings£19.99
£30.99 -
Murdered Out Shook Energy Shots£1.99
£19.99 -
Applied Nutrition Creatine Gummies 3000mg£17.99
£19.99 -
Mutant Test Testosterone Support 90 Veg Capsules£19.99
£22.99 -
BOLD Nutrition ALPHA Stack 60 Capsules£24.99
£29.99 -
Applied Nutrition Stainless Steel Flask 500ml£4.99
£6.99 -
Applied Nutrition Cooler Cup£4.99
£9.99