10 Best Whey Protein Muscle Mass in The UK

Last updated on 13/09/2025
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9.7
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Optimum Nutrition Gold Standard 100% Whey Muscle Building and Recovery Protein Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Double Rich Chocolate Flavour, 73 Servings, 2.26 kg
Optimum Nutrition
Optimum Nutrition Gold Standard 100% Whey Muscle Building and Recovery Protein Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Double Rich Chocolate Flavour, 73 Servings, 2.26 kg
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Why We Love It
  • Supports fitness journey from start.
  • Assists in muscle gain, recovery.
  • Variety of flavors available.
Main Highlights
  • Optimum Nutrition’s Gold Standard 100% WHEY is the world’s best-selling protein powder* designed to support your fitness journey from day one
  • FAST-ABSORBING whey protein with whey protein isolate as the main ingredient helps with muscle gain and supports recovery* after every training session
  • The ON whey protein formula is Informed Choice certified, contains naturally-occurring BCAAs and GLUTAMINE and is LOW IN SUGAR and fat
  • Available in a VARIETY OF SIZES and FLAVOURS: double rich chocolate, banana cream, vanilla ice cream, unflavored protein powder and more
  • EASY & CONVENIENT: mix one scoop in 180-240 ml of cold water; best enjoyed in the morning or/and during the 30 minutes just before or immediately after training
  • *Source: Euromonitor International Limited; Consumer Health 2023 edition, Sports Protein Powder category, % retail value shares, 2022 data
  • ** Source EFSA Journal 2010;8(10):1811; 2011;9(6):2203
9.7
Exceptional
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2
9.7
Exceptional
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Optimum Nutrition Serious Mass Protein Powder with Creatine, Glutamine, 25 Vitamins and Minerals, Vanilla Flavour, 16 Servings, 5.45KG
Optimum Nutrition
Optimum Nutrition Serious Mass Protein Powder with Creatine, Glutamine, 25 Vitamins and Minerals, Vanilla Flavour, 16 Servings, 5.45KG
12% OffFree Shipping
Why We Love It
  • Supports muscle growth and performance.
  • Promotes recovery with essential nutrients.
  • Offers tasty, customizable protein smoothies.
Main Highlights
  • PACKAGING MAY VARY: New look, with the same trusted Quality!
  • Mass gainer with whopping 1250 CALORIES and 50g of PROTEIN per serving. Contains less than 5g fat!
  • Comes as an instantised powder. Mix with fruit or nut butters for a tasty and calorific post-workout drink or take between meals to ENCOURAGE MUSCLE GROWTH
  • PROUDLY CONTAINS NO ADDED SUGAR! Boasts 24 vitamins and minerals per serving
  • GREAT VALUE FOR MONEY. Serious Mass protein powder delivers a high-calorie content and quality protein at competitive rates
  • Provides calories, ENCOURAGING WEIGHT GAIN and refuels body’s glycogen stores
  • Low fat mass gainer with over 1250 CALORIES and 50g of PROTEIN per serving to support muscle growth* plus 3 grams of CREATINE MONOHYDRATE to support performance**
  • No added sugar protein powder formula with 25 vitamins and minerals and less than 5g fat per serving, plus over 250 grams of CARBOHYDRATES helping support muscle recovery***
  • Serious Mass protein powder comes in 6 flavours (banana, chocolate peanut butter, chocolate, cookies & cream, strawberry and vanilla) & contains sweetener
  • To prepare weight gainer mix 2 scoops with 710 ml of water or plant milk, add fruit or nut butters for a tasty and calorific post workout or between meals protein smoothie
9.7
Exceptional
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9.5
Superb
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USN Muscle Fuel Anabolic All-In-One Muscle Mass Gainer, Chocolate Flavour - 2kg, 54g Protein Powder, 5g Creatine Powder & 5g BCAA Powder For Maximum Muscle Growth, Post Workout Recovery Drink Mix
USN
USN Muscle Fuel Anabolic All-In-One Muscle Mass Gainer, Chocolate Flavour - 2kg, 54g Protein Powder, 5g Creatine Powder & 5g BCAA Powder For Maximum Muscle Growth, Post Workout Recovery Drink Mix
10% OffFree Shipping
Why We Love It
  • All-in-one protein and creatine.
  • Increases physical performance notably.
  • Reduces muscle protein breakdown.
Main Highlights
  • USN Muscle Fuel Anabolic protein drink mix: High protein shake powder with Vitamins, Minerals, Carbohydrates, BCAAs, Amino Acids and Creatine. Premium dietary supplement designed to support muscle building
  • Premium women's and men's supplements: USN diet supplements offer proven benefits, when taken alongside a balanced diet and healthy lifestyle. Always consult a healthcare professional first
  • Mass gainer protein powder: Chocolate flavoured drink powder with 54g of premium quality protein, 77g of carbohydrates and 850mg of HMB to support muscle recovery, growth and performance
  • Reach your goals: All in one muscle gain building stack, combined with raw creatines and carbohydrates, so creatine is easily absorbed and transported around the body. Easy to mix with water
  • Ultimate Sports Nutrition: USN are at the forefront of sports nutrition research, making effective sports nutrition supplements for professional and non-professional athletes, pre or post workout
9.5
Superb
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9.5
Superb
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The Bulk Protein Company, SERIOUS GAINZ - Whey Protein Powder - Weight Gain, Mass Gainer - 30g Protein Powders (Chocolate, 5kg)
The Bulk Protein Company
The Bulk Protein Company, SERIOUS GAINZ - Whey Protein Powder - Weight Gain, Mass Gainer - 30g Protein Powders (Chocolate, 5kg)
13% OffFree Shipping
Why We Love It
  • Builds muscle with high protein.
  • Promotes mass gain effectively.
  • Offers excellent value for money.
Main Highlights
  • 30g PROTEIN PER SERVING TO HELP BUILD MUSCLE - Protein Isolate powder that contains 30 grams of high quality Protein per serving. A convenient and easy way to help you meet your daily protein needs. Use after training to quickly heal micro-tears in muscle tissues, which speeds up recovery, reduces muscle soreness and leads to stronger and bigger muscles over time.
  • PUT ON SIZE AND GAIN MASS - With 468 lean calories per serving, Serious Gainz protein powder is ideal when BULKING. Use as part of a balanced diet to help add body mass and increase weight gain. Contains 81g of carbohydrates which will help your body absorb the protein within, turning it into muscle mass to help towards improving your overall body composition.
  • PROTEIN SHAKE THAT TASTES GREAT - Add 3 scoops of powder to 400-500ml of water or milk and mix well to create a great tasting Protein Shake! Can also be enjoyed in smoothies, with oats or when added to a pancake mix. Protein powders don't have to be boring, so we made 10 different flavours for you to choose from.
  • HIGH QUALITY WHEY PROTEIN - Whey digests quickly and is rich in branched-chain amino acids (BCAAs). One of these BCAAs, Leucine, plays a major role in promoting muscle growth and recovery after resistance and endurance exercise. When amino acids are digested and absorbed into your bloodstream, they become available for muscle protein synthesis, which is the creation of new muscle.
  • EXCELLENT VALUE 5kg TUB WITH 40 SERVINGS - With up to a month's supply of high quality protein powder, we offer great value for your money compared with other brands. We recommend one serving per day to consistently meet your daily protein goal. Consume immediately post-training on workout days and between breakfast and lunch on non-workout days. Comes with scooper for measurements.
9.5
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9.4
Superb
MuscleTech MassTech Elite Protein Powder, Weight & Muscle Mass Gainer, Whey Isolate Mass Protein Powder With 3g Creatine, 80g Protein, 18g BCAA, 14 Servings, 3.2kg, Vanilla Cake
Muscletech
MuscleTech MassTech Elite Protein Powder, Weight & Muscle Mass Gainer, Whey Isolate Mass Protein Powder With 3g Creatine, 80g Protein, 18g BCAA, 14 Servings, 3.2kg, Vanilla Cake
Why We Love It
  • Aids in increasing muscle size.
  • Helps break strength plateaus.
  • Ideal for bulking phase.
Main Highlights
  • HIGH PROTEIN MUSCLE BUILDING MASS GAINER - Delivers 80 g protein, 163 g carbs, 3 g creatine, and over 1,000 nutrient-dense calories (with 510 mL of skim milk)
  • HIGH PROTEIN MUSCLE BUILDING MASS GAINER - Delivers 80 g protein, 163 g Carbs, 3 g creatine, and over 1,000 nutrient-dense calories (with 510 mL of Skim Milk)
  • STRENGTH-ENHANCING MASS GAINER - MuscleTech researchers developed this muscle mass gainer for those who have struggled with adding size, are in their bulking phase, or want to break through their strength plateaus
  • EXPLICITLY CLEAN HIGH-QUALITY PROTEIN - Using a cold-filtration microfiltration process, mass-tech elite guarantees a high-quality protein profile that removes unwanted fats
  • ENHANCED WITH CREATINE - Unlike some other leading gainers, Mass-Tech Elite delivers a 3-gram researched dose of creatine to increase strength
9.4
Superb
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9.4
Superb
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Optimum Nutrition Gold Standard 100% Whey Muscle Building and Recovery Protein Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Extreme Milk Chocolate Flavour, 28 Servings, 896 g
Optimum Nutrition
Optimum Nutrition Gold Standard 100% Whey Muscle Building and Recovery Protein Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Extreme Milk Chocolate Flavour, 28 Servings, 896 g
18% OffFree Shipping
Why We Love It
  • Supports muscle gain and recovery.
  • Low in sugar and fat.
  • Variety of flavors available.
Main Highlights
  • Optimum Nutrition’s Gold Standard 100% WHEY is the world’s best-selling protein powder* designed to support your fitness journey from day one
  • FAST-ABSORBING whey protein with whey protein isolate as the main ingredient helps with muscle gain and supports recovery* after every training session
  • The ON whey protein formula is Informed Choice certified, contains naturally-occurring BCAAs and GLUTAMINE and is LOW IN SUGAR and fat
  • Available in a VARIETY OF SIZES and FLAVOURS: double rich chocolate, banana cream, vanilla ice cream, unflavored protein powder and more
  • EASY & CONVENIENT: mix one scoop in 180-240 ml of cold water; best enjoyed in the morning or/and during the 30 minutes just before or immediately after training
9.4
Superb
Save 18%
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7
9.4
Superb
Save 11%
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Vanilla, 8 Servings, 2.73 kg, Packaging May Vary
Optimum Nutrition
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Vanilla, 8 Servings, 2.73 kg, Packaging May Vary
11% OffFree Shipping
Why We Love It
  • Boosts muscle growth and performance.
  • Supports muscle recovery effectively.
  • Delicious variety of flavours.
Main Highlights
  • CALORIE RICH PROTEIN SOURCE – the ultimate gainer powder which can be used post-workout or between meals
  • SUPPORTS SERIOUS SIZE – great for those aspiring to be bigger, for those who find it hard to gain weight / muscle, or for those on the go who have high caloric needs due to intense training
  • 1,255-1272 CALORIES per serving – when mixed with water
  • 50 g – 53 g PROTEIN per serving
  • 250 g+ CARBOHYDRATES per serving
  • ADDED CREATINE, L-GLUTAMINE & GLUTAMIC ACID
  • INSTANTISED POWDER – helps the powder dissolve easily and mixes well in a blender with other ingredients such as fruit and nut butters for added calories
  • 24 VITAMINS & MINERALS per serving
  • NO ADDED SUGAR
  • AVAILABLE IN 6 LB TUBS OR 12 LB BAGS
9.4
Superb
Save 11%
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9.3
Superb
SCI-MX Total Mass - Advanced Muscle Mass Gainer Protein Powder - Muscle Growth & Weight Gain - Chocolate • 32g Protein + 478 Calories per Serving • 2kg
SCI-MX
SCI-MX Total Mass - Advanced Muscle Mass Gainer Protein Powder - Muscle Growth & Weight Gain - Chocolate • 32g Protein + 478 Calories per Serving • 2kg
Why We Love It
  • High protein intake guaranteed.
  • Rapid muscle recovery support.
  • Delicious, indulgent flavors available.
Main Highlights
  • ⚡ FUEL YOUR MUSCLE GROWTH, WORKOUTS & RECOVERY WITH OUR MASS GAINER. A serious game-changer when it comes to high protein intake. Unlock your potential, transform your physique, and elevate your fitness by fuelling your body with the energy it craves during intense workouts and recovery phases. Includes an impressive 32g of protein per serving, providing your body with the optimum and essential building blocks required for muscle growth and repair. Also available in Strawberry and Vanilla.
  • 🏋️‍♂️ BENEFITS: This mass gainer protein contains two high-quality sources of protein: whey protein concentrate and soy protein isolate. These premium protein sources are meticulously selected to ensure rapid absorption and bioavailability, enabling your muscles to receive the nourishment they need when they need it most. Consuming sufficient calories for healthy weight gain made easy with carbs to provide your body with enough energy to workout and recover at your best.
  • 🍫 HOW & WHEN TO USE: Add 3 level scoops (125g) to 400ml of cold water.Recommended no more than 2 servings per day. Ingredients: Maltodextrin, SOY Protein Isolate, WHEY Protein Concentrate (MILK), OAT Flour, Cocoa Powder, Flavouring, Thickener (Xanthan Gum), Sweetener (Sucralose), Sodium Chloride, DigeZyme(Digestive Enzymes). This is a food supplement. Do not exceed daily dose. Store out of reach of children. Do not substitute for a varied / healthy diet.
  • 🧡 POWERING EVERY GOAL: Whether you want to build muscle, bulk, reduce body fat or peak your performance, our core focus is delicious, fitness-focused nutrition in the most fun and indulgent flavours. Our products are made to complement all types of training and performance goals – whether you’re a casual gym goer, an athlete or sportsperson, you can reap the benefits of our mouthwateringly delicious and flavoursome proteins.
  • ⭐ WHY SCI-MX: Our goal is to help nurture, support, and inspire the sportsperson in all of us. From recovery to competition training, there’s a SCI-MX product to help you achieve your goal. From high-quality protein powders, pre-workout and post-workout blends like creatine monohydrate to high-protein snacks such as flapjack bars, we've got you covered. Our no-nonsense approach to sports nutrition supplements guarantees you’ll always receive premium quality, great value products.AD11:AD13
9.3
Superb
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9.2
Superb
Myprotein Impact Whey Weight Gainer Protein (2.5kg (Pack of 1), Chocolate Smooth)
Myprotein
Myprotein Impact Whey Weight Gainer Protein (2.5kg (Pack of 1), Chocolate Smooth)
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Why We Love It
  • Promotes healthy weight gain.
  • Provides high-quality protein.
  • Convenient and redesigned packaging.
Main Highlights
  • 31g of protein
  • 50g of carbs
  • 388 calories per serving
9.2
Superb
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9.1
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MUTANT Mass | Muscle Mass Gainer | 1100 Calories, 56g Protein, Whole Food Carbs, BCAAs, and Glutamine | Ultimate Hardcore Weight Gainer Shake | 2270g | Triple Chocolate
Mutant
MUTANT Mass | Muscle Mass Gainer | 1100 Calories, 56g Protein, Whole Food Carbs, BCAAs, and Glutamine | Ultimate Hardcore Weight Gainer Shake | 2270g | Triple Chocolate
Why We Love It
  • Specially formulated high-calorie content.
  • Contains quality proteins and nutrients.
  • Transparency of ingredients used.
Main Highlights
  • HARDCORE MASS-BUILDING CALORIES – Delivers an incredible 1,100 nutrient-dense calories per serving to support fast muscle growth and strength gains.
  • ADVANCED PROTEIN FORMULA – Includes whey protein isolate, hydrolyzed whey, micellar casein, and milk protein concentrate to power recovery and build lean mass.
  • ELITE WHOLE-FOOD CARB SOURCES – Packed with complex carbohydrates from sweet potato, rolled oats, and waxy maize starch to provide clean, long-lasting energy.
  • AMINO ACID & RECOVERY SUPPORT – Features 36g of essential amino acids (EAAs), including 10.4g Glutamine and 12.2g BCAAs, for muscle repair and growth.
  • ENGINEERED FOR EXTREME RESULTS – Designed for athletes looking to smash plateaus, this gainer provides quality macros without unnecessary fillers.
9.1
Superb
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