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10 Best Mass Gain Protein Powder in The UK

Last updated on 07/07/2025

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Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate, 16 Servings, 5.45 kg

6% Off

Why We Love It

Supports muscle growth and performance.
Promotes muscle recovery after workouts.
Comes in 6 delicious flavours.

Main Highlights

Low fat mass gainer with over 1262 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 248 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

Warrior Mass Protein Powder – 5kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Double Chocolate, 5kg)

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Why We Love It

Supports muscle, strength, and gains.
Six tasty protein shake flavours.
Blend of fast, slow protein.

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 Ideal post-workout, ideal between meals, and an exceptional addition of clean food support to your daily diet. Warrior MASS has got your back.

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Strawberry, 8 Servings, 2.73 kg, Packaging May Vary

3% OffFree Shipping

Why We Love It

Supports muscle growth and performance.
Promotes recovery with carbohydrates.
Offers tasty, diverse flavor options.

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

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

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

USN Hyperbolic Mass French Vanilla 2kg: 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

Superior taste meets muscle gain.
High calorie for bulk enhancement.
Nutrient-dense for optimum results.

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 vanilla 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.

Optimum Nutrition Gold Standard 100% Whey Protein, Muscle Building Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Chocolate Peanut Butter Flavour, 28 Servings, 896 g

17% OffFree Shipping

Why We Love It

Supports fitness journey from day one.
Helps with muscle gain, recovery.
Variety in 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

Packed with 1000 extra calories.
Enriched with 172g carbohydrates.
Boosted with 50g protein.

Main Highlights

EXTRA CALORIES TO HELP BUILD MUSCLE MASS - 1000 Calories. Instead of force-feeding another meal, you may want to opt to drink a 1,000-calorie shake to reach your caloric intake goals.
CRAMMED WITH CARBS -172g Carbs per serving. Carbohydrates are your body's main source of energy: They help fuel your brain, kidneys, heart muscles, and central nervous system. For instance, fiber is a carbohydrate that aids in digestion, helps you feel full, and keeps blood cholesterol levels in check. Your body can store extra carbohydrates in your muscles and liver for use when you're not getting enough carbohydrates in your diet.
HIGH PROTEIN - 50g per Serving While it has many vital roles in the body, protein is crucial for muscle growth because it helps repair and maintain muscle tissue
LOADED WITH BCAA AND GLUTAMINE - BCAAs may increase muscle growth, reduce soreness and fatigue, prevent muscle wasting, and support liver health. BCAAs have been shown to decrease muscle damage, which may help reduce the length and severity of delayed onset muscle soreness.
ADDED CREATINE MONOHYDRATE - Creatine is the most effective supplement for increasing muscle mass and strength. Creatine It’s a fundamental supplement in the bodybuilding and fitness communities. Research shows supplementing with creatine can double your strength and lean muscle gains compared to training alone

The Bulk Protein Company

The Bulk Protein Company - Serious Gainz – Mass Gainer Protein Powder – Banana 5kg, B142-BA

38% OffFree Shipping

Why We Love It

Optimal for muscle recovery and growth.
Promotes mass gain efficiently.
Amazing taste with variety.

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

Reflex Nutrition Instant Mass Heavyweight - Mass Gainer - Over 1000 Kcal per Serving, 60g Protein, Creatine - High Calorie Post Workout or Before Bed Protein Shake (Chocolate Perfection, 2 kg)

Why We Love It

Promotes muscle maintenance overnight.
Guarantees premium quality ingredients.
Suitable for various dietary needs.

Main Highlights

Engineered for Gains: This seamless protein shake mix is specifically formulated to accelerate muscle and weight gains and improve post-workout recovery, enhancing overall workout performance for the dedicated, hard gainer and serious athlete alike
Excellent Nutrition Profile: Packed with quality ingredients, each protein shake serving delivers over 1000 kcals, 200g of complex carbohydrates, 60g of muscle gain protein, critical EAAs, creatine, 18 vitamins and minerals (B12, B6, C, Iron, Zinc)
Outstanding Taste Sensation: Our Chocolate Perfection mass gainer flavour isn't just a treat for your taste buds - it's a deliciously creamy escape into indulgence with every sip, all while you are fueling your body for mass gain and muscle recovery
Optimal Timing for Maximum Impact: Consume Instant Mass Heavyweight high protein shake between meals for a positive nitrogen balance, 20-30 minutes post workout for best results or 45-60 minutes before sleep to aid overnight muscle maintenance
Trusted Quality Assurance: Reflex Nutrition's promise to quality means whey protein powder from grass-fed cows - Protein Sources are Glutamine Peptides, Whey Protein Concentrate, Milk Protein, Hydrolysed Whey Protein
Produced in an Informed Sport Registered Facility - Suitable for vegetarians and Halal certified - Zero added sugars, artificial colors, or soy protein, assuring a conscientious choice of weight gainer for your muscle-building objectives

8.9

Excellent

We scanned 263 products

We reviewed these offers relevant to the Mass Gain Protein Powder within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Optimum Nutrition, Warrior, USN, Myprotein, XL Nutrition, The Bulk Protein Company, Reflex, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Mass Gain Protein Powder in the market, we considered we took a deep dive into 1316 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate, 16 Servings, 5.45 kg. We love many things about this product by Optimum Nutrition. What sets it apart from the competition is Supports muscle growth and performance. , Promotes muscle recovery after workouts. , Comes in 6 delicious flavours.
The best value product for most shoppers and where user satisfaction is continuously the highest is Warrior Mass Protein Powder – 5kg – Serious Mass Gainer – High Calorie, Weight Gain Supplement – 61g of Protein, 18 Servings, 1000+ Calories Shake, Supports Muscle Growth (Double Chocolate, 5kg) by Warrior based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Mass Gain Protein Powder and the best cost-to-value ratio is The Bulk Protein Company - Serious Gainz – Mass Gainer Protein Powder – Banana 5kg, B142-BAat The Bulk Protein Company with a 38% discount.
Our list of the best Mass Gain Protein Powder is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Mass Gain Protein Powder in The UK

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We scanned 263 products

We concluded that: