10 Best Weight Gain Protein Powder in The UK
Last updated on 13/09/2025
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1
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition
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Optimum Nutrition
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
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Why We Love It
- Supports muscle growth and performance.
- Healthy, low-fat, high-calorie content.
- Six tasty, varied flavors.
Main Highlights
- 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
- Source EFSA Journal *2010;8(10):1811; 2011;9(6):2203; ** 2011;9(7):2303; ***2011; 9(7):2303
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Value for Money
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Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Vanilla Cheesecake, 5kg)
Warrior
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Warrior
Warrior Mass Protein Powder – 5.04kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Vanilla Cheesecake, 5kg)
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Why We Love It
- Supports muscle, strength, mass gains.
- Helps meet daily protein needs.
- Offers six tasty flavours.
Main Highlights
- ✅ WARRIOR MASS – Has been designed to support muscle, strength, and mass gains. If you're an MMA fighter, boxer, or rugby player, or train aggressively to get REAL results from your body, Warrior MASS is for you!
- ✅ 61g PROTEIN PER SERVING TO BUILD MUSCLE MASS – A convenient supplement to meet your daily protein needs. Our Warrior MASS protein shake is packed with over 1000+ calories!
- ✅ 6 FLAVOURS – Warrior MASS comes in 6 tasty flavours: Double Chocolate, White Chocolate, Banana Crème, Vanilla Cheesecake, Salted Caramel, and Strawberry Crème.
- ✅ 5.04KG & 18 SERVINGS – An excellent value mass/weight gainer. Our recommended serving size is 2 rounded scoops (280g), and we suggest mixing it with 300 ml of water.
- ✅ PROTEIN BLEND – Made with Whey Protein Concentrate to provide an instant protein injection and Micellar Casein, which digests slowly over 8 hours. It’s perfect post-workout, ideal between meals, and an exceptional addition of clean food support to your daily diet. Warrior MASS has got your back.
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USN Hyperbolic Mass Strawberry Cheesecake 6kg: High Calorie Mass Gainer Protein Powder for Muscle Building and Weight Gain - Improved Formula & Flavour with 7.5g Creatine Monohydrate and Less Sugar
USN
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USN
USN Hyperbolic Mass Strawberry Cheesecake 6kg: High Calorie Mass Gainer Protein Powder for Muscle Building and Weight Gain - Improved Formula & Flavour with 7.5g Creatine Monohydrate and Less Sugar
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Why We Love It
- Uncompromised taste with muscle mass.
- High calorie for quick results.
- Nutrition-rich performance booster.
Main Highlights
- Our best mass gainer yet: Our best-tasting mass gainer is for those who want to increase their muscle mass, but don't want to compromise on the taste of their protein drink.
- High calorie bulk powder: With up to 1183 calories our all-in-one mass and weight gainer is ideal for individuals who struggle to gain muscle mass and want a fast-acting, easy-mixing and effective formula.
- Amazing taste, great results: The improved formula of our delicious strawberry flavour mass gainer provides a greater post-workout effectiveness, with a smoother taste - all delivered with less Sugar.
- A weight gainer with nutrition: Our mass protein powder contains a massive 60g of protein per serving, partnered with 7.5g of Creatine and 18 vitamins and minerals (B12, B6, C, Magnesium, Iron) to help you be at your best.
- For best results: To get the best results from Hyperbolic Mass, take 1 servings daily, either after training or as a snack between meals. Simply mix 4 scoops (300g) of the protein powder with 900ml of cold water and enjoy.
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4
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
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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
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5
The Bulk Protein Company, SERIOUS GAINZ - Whey Protein Powder - Weight Gain, Mass Gainer - 30g Protein Powders (Chocolate, 5kg)
The Bulk Protein Company
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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.
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6
Myprotein Impact Whey Weight Gainer Protein (2.5kg (Pack of 1), Chocolate Smooth)
Myprotein
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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
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7
Applied Nutrition Critical Mass Professional - Weight Gain Protein Powder, High Calorie Weight Gainer, Lean Mass (2.4kg - 16 Servings) (Chocolate)
Applied Nutrition
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Applied Nutrition
Applied Nutrition Critical Mass Professional - Weight Gain Protein Powder, High Calorie Weight Gainer, Lean Mass (2.4kg - 16 Servings) (Chocolate)
19% OffFree Shipping
Why We Love It
- High-quality lean mass gainz.
- New formula with whey isolate.
- Tested for athletic assurance.
Main Highlights
- THE UK'S MOST TRUSTED MASS GAINER FOR SERIOUS SIZE & STRENGTH – Critical Mass Professional is the ultimate high-calorie weight gainer, engineered for those who want to bulk up, increase muscle mass, and fuel intense workouts. This mass gainer supplement is trusted by hard gainers, bodybuilders, and athletes looking for serious results.
- 1,000+ CALORIES PER SERVING – PACKED WITH HIGH-QUALITY PROTEIN & CARBS – Delivers a caloric surplus essential for lean muscle gain. Each serving contains a blend of fast-absorbing and slow-digesting proteins, including ISO-XP Whey Isolate, to maximize muscle recovery and growth. Combined with a premium carbohydrate complex, it helps sustain energy levels and support muscle glycogen replenishment.
- POWERFUL CREATINE & GLUTAMINE COMPLEX FOR PERFORMANCE & RECOVERY – Enhanced with Creatine Monohydrate, Critical Mass Professional boosts strength, endurance, and muscle power output for high-intensity training. Includes L-Glutamine & Glutamic Acid, key amino acids that aid muscle recovery, reduce fatigue, and support immune function.
- OPTIMAL WEIGHT GAIN FORMULA FOR HARD GAINERS & ATHLETES – Whether you struggle to put on weight, need extra calories due to intense training, or want to bulk up, this high-calorie gainer provides the perfect macronutrient balance. Ideal as a post-workout shake, meal replacement, or between-meal supplement for continuous muscle fuel.
- EASY MIXING & DELICIOUS FLAVOURS FOR MAXIMUM ENJOYMENT – Designed for convenience, this instantized protein powder mixes effortlessly in water or milk, creating a smooth, creamy texture with no lumps or grittiness. Available in 6 mouth-watering flavours: Chocolate, Banana, Vanilla, Chocolate Mint, Strawberry, and White Chocolate & Raspberry.
- TESTED FOR ATHLETES: at Applied Nutrition we carefully select and monitor each product through our quality management system to bring you the highest level of assurance. Critical Mass Professional is no exception and is tested at an ISO 17025 accredited lab.
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USN Muscle Fuel Anabolic All-In-One Muscle Mass Gainer, Strawberry Flavour - 2kg, 54g Protein Powder, 5g Creatine Powder & 5g BCAA Powder For Maximum Muscle Growth, Post Workout Recovery Drink Mix
USN
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USN
USN Muscle Fuel Anabolic All-In-One Muscle Mass Gainer, Strawberry Flavour - 2kg, 54g Protein Powder, 5g Creatine Powder & 5g BCAA Powder For Maximum Muscle Growth, Post Workout Recovery Drink Mix
20% OffFree Shipping
Why We Love It
- High protein content ensures growth.
- Enhances physical performance substantially.
- Includes industry-leading nutrition formula.
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: Strawberry 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
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Optimum Nutrition Gold Standard Whey Protein, Muscle Building Powder with Naturally Occurring Glutamine and Amino Acids, Double Rich Chocolate, 29 Servings, 899 g, Packaging May Vary
Optimum Nutrition
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Optimum Nutrition
Optimum Nutrition Gold Standard Whey Protein, Muscle Building Powder with Naturally Occurring Glutamine and Amino Acids, Double Rich Chocolate, 29 Servings, 899 g, Packaging May Vary
18% OffFree Shipping
Why We Love It
- Supports muscle gain and recovery.
- Certified, low-sugar protein formula.
- Variety of sizes, flavors.
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.
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Weight Gainer High Protein Powder Shakes 4KG Vegetarian Serious Mass, Gainz Heavyweight, Weight Gain with Added Creatine, Glutamine and BCAA Powder Made in UK by PROELITE (4KG, Strawberry)
PROELITE
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PROELITE
Weight Gainer High Protein Powder Shakes 4KG Vegetarian Serious Mass, Gainz Heavyweight, Weight Gain with Added Creatine, Glutamine and BCAA Powder Made in UK by PROELITE (4KG, Strawberry)
Why We Love It
- Maximizes muscle development with protein.
- Promotes weight gain effectively.
- Delicious and easy preparation.
Main Highlights
- 💪 𝟑𝟏𝐆 𝐏𝐑𝐎𝐓𝐄𝐈𝐍 𝐏𝐄𝐑 𝐒𝐄𝐑𝐕𝐈𝐍𝐆 𝐓𝐎 𝐇𝐄𝐋𝐏 𝐁𝐔𝐈𝐋𝐃 𝐌𝐔𝐒𝐂𝐋𝐄 - Our 2-Quality Source Protein powder provides 31 grams of premium-quality protein per serving, making it an easy and convenient solution to meet your daily protein requirements. Perfect for post-training recovery, this protein blend aids in repairing micro-tears in muscle tissue, accelerating recovery, and reducing muscle soreness. With regular use, it supports muscle growth and strength, helping you achieve stronger and larger muscles over time.
- 💪 𝐏𝐔𝐓 𝐎𝐍 𝐒𝐈𝐙𝐄 𝐀𝐍𝐃 𝐆𝐀𝐈𝐍 𝐌𝐀𝐒𝐒 - Packed with 478 lean calories per serving, Gains Protein Powder is designed to support your bulking goals. As part of a balanced diet, it helps increase body mass and promotes healthy weight gain. With 84g of carbohydrates per serving, this formula aids in protein absorption, turning nutrients into muscle mass to enhance your overall body composition. Ideal for those looking to build size and strength effectively.
- 💪 𝐏𝐑𝐎𝐓𝐄𝐈𝐍 𝐒𝐇𝐀𝐊𝐄 𝐓𝐇𝐀𝐓 𝐓𝐀𝐒𝐓𝐄𝐒 𝐆𝐑𝐄𝐀𝐓 - Enjoy a delicious protein boost by mixing 3 scoops of powder with 300-400ml of water or milk for a great-tasting protein shake! Versatile and easy to incorporate, it can also be blended into smoothies, stirred into oats, or added to pancake batter. Protein powders don’t have to be dull—that’s why we offer 5 unique flavors for you to enjoy variety with every serving.
- 💪 𝐇𝐈𝐆𝐇 𝐐𝐔𝐀𝐋𝐈𝐓𝐘 𝐖𝐇𝐄𝐘 𝐏𝐑𝐎𝐓𝐄𝐈𝐍 - Our whey protein is crafted for rapid digestion and packed with branched-chain amino acids (BCAAs), including Leucine—a key amino acid that supports muscle growth and recovery after both resistance and endurance exercise. When consumed, these amino acids are quickly absorbed into the bloodstream, fueling muscle protein synthesis and enabling the creation of new muscle tissue. Perfect for anyone looking to enhance muscle repair and growth.
- 💪 𝐄𝐗𝐂𝐄𝐋𝐋𝐄𝐍𝐓 𝐕𝐀𝐋𝐔𝐄 𝟒𝐊𝐆 𝐓𝐔𝐁 𝐖𝐈𝐓𝐇 𝟑𝟐 𝐒𝐄𝐑𝐕𝐈𝐍𝐆𝐒 - Get up to a month’s supply of premium protein powder with our 4kg tub, offering outstanding value compared to other brands. Each tub includes 32 servings, with one serving recommended daily to help you consistently reach your protein goals. On workout days, consume immediately post-training, and on non-workout days, enjoy it between breakfast and lunch. For easy measurement, each tub comes with a convenient scooper
- 💪 𝐄𝐍𝐇𝐀𝐍𝐂𝐄𝐃 𝐖𝐈𝐓𝐇 𝐂𝐑𝐄𝐀𝐓𝐈𝐍𝐄 𝐌𝐎𝐍𝐎𝐇𝐘𝐃𝐑𝐀𝐓𝐄, 𝐋-𝐆𝐋𝐔𝐓𝐀𝐌𝐈𝐍𝐄, 𝐚𝐧𝐝 𝐁𝐂𝐀𝐀𝐬 - Our formula stands out with added Creatine Monohydrate, L-Glutamine, and BCAAs to support superior recovery and performance—ingredients not commonly included by other brands. Creatine aids in strength and power, L-Glutamine supports muscle repair, and BCAAs boost muscle recovery post-workout. This unique blend is designed to help you recover faster and come back stronger, setting it apart from standard protein powders.
- 💪 𝐕𝐄𝐆𝐄𝐓𝐀𝐑𝐈𝐀𝐍 💪 𝐆𝐌𝐎 𝐅𝐑𝐄𝐄 💪 𝐇𝐀𝐋𝐀𝐋 💪 𝐊𝐎𝐒𝐇𝐄𝐑 💪 𝐌𝐀𝐃𝐄 𝐈𝐍 𝐔𝐊
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