10 Best Weight Gain Supplements For Men in The UK

Last updated on 26/05/2025

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Kinetica Sports OatGain Weight Gainer - Raspberry Yoghurt Flavour | 630 Cal, 46g Protein & 82g Carbs/Serve, 15 Servings/2.4Kg | Optimum Grass Fed Protein Supplement | High Calorie & Easy Mixability

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Why We Love It

Unrivalled taste and aroma.
Easy to mix consistency.
Boost energy, repair muscles.

Main Highlights

Irresistible Flavour for Maximum Enjoyment: Kinetica Sports OatGain Mass Gainer comes in two mouthwatering flavours: Chocolate Caramel Nut and Raspberry Yoghurt. Each delivers a rich, satisfying taste and aroma, making it easy and enjoyable to fuel your body with extra calories and nutrients to support high training loads.
Smooth & Easy Mixability: Experience hassle-free mixing with Kinetica Sports OatGain Weight Gainer. Whether you prefer water, milk, or milk alternatives, our mass gainer powder mixes easily with milk or water for a high protein, high calorie shake in seconds.
High-Calorie Fuel for Muscle & Energy: Each serving of Kinetica Sports OatGain mass gainer provides 600+ calories and 46g of protein to help you gain weight, increase overall muscle mass and replenish your energy stores, making it ideal for intense workouts and recovery. Kinetica Sports Oatgain mass gainer contains only 6.4g of sugar per serving.
Convenient & Versatile for Any Lifestyle: Kinetica OatGain weight gainer is perfect for anyone looking to intake a high volume of calories for weight gain or energy regeneration. It’s suitable for vegetarians and can be used as a post-workout shake, meal replacement, or mid-day snack. Simply mix one serving with water, milk, or your preferred beverage for a quick and nutritious option.
Quality Assured & Batch-Tested for Safety: Kinetica Sports OatGain mass gainer is batch-tested under the Informed-Sport testing program to ensure that every batch complies with WADA’s high standards. You can trust that OatGain is free from banned substances and made with quality ingredients to fuel your training safely and effectively.

The Bulk Protein Company

Anabolic Gainz 5kg – Mass Gainer – 30g Protein Powder – Contains 3g Creatine Per Serving – Post Workout Recovery Fuel to Build Lean Muscle – 40 Servings – GMP Certified – TBPC (Chocolate)

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Why We Love It

Packed with protein and calories.
Supports muscle growth effectively.
Great taste and mixability.

Main Highlights

ANABOLIC GAINZ – Is a protein powder, designed to supplement muscle growth and to be consumed as a post-workout shake. We’re now available in the staple flavours, these are Chocolate, Strawberry, and Vanilla.
NUTRITIONALS – Our Anabolic Gainz Mass Gainer comes in a 5kg tub containing 30g of Protein and is packed with over 450 calories! In addition, we’ve added 3g of Creatine per serving to support muscle growth, recovery, and performance.
MACROs – Our shake contains Carbohydrates, Creatine, Amino Acids, Vitamins, and Minerals. It’s a great-tasting protein drink that will slot straight into your supplement stack.
40 SERVINGS – With over a month's supply this protein powder will help reach your goals. It mixes well and doesn’t require a blender, simply look out for our TBPC Gainz 800ml Shaker.
TBPC – Here at The Bulk Protein Company we're serious about value, huge protein levels, and incredible results in your training & diet. If you're serious about training, Anabolic Gainz is for you. GMP Certified, Manufactured in the UK.

USN Hyperbolic Mass French Vanilla 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

Tastes fantastic, builds muscle.
High-calorie, easy-mixing formula.
Packed with nutritious protein.

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.

Out Angled Method Mass Gainer Powder, Strawberry Cream 6kg 100 Scoops | High Calorie Whey Protein Powder Weight Gainer for Muscle Growth

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Why We Love It

Rapid post-workout recovery.
Balanced energy source.
Delicious flavor variety.

Main Highlights

High-Quality Protein Source - A mass gainer supplement containing whey protein, derived from milk, provides a rich source of essential amino acids. Whey protein powder is well-known for its rapid absorption, making it an excellent choice for post-workout recovery and muscle growth.
Balanced Carbohydrate Blend - The combination of maltodextrin, dextrose monohydrate, waxy maize, and fine oats creates a balanced carbohydrate blend with high calories. These complex and simple carbohydrates provide sustained energy, making them suitable for athletes and bodybuilders who need to refuel after intense workouts.
Enhanced Caloric Intake - Mass gainer supplements are designed to help individuals with high-calorie needs gain and maintain muscle growth. The inclusion of whole milk powder contributes to the supplement's overall caloric content, making it a convenient way to boost daily calorie intake for those seeking to gain weight.
Convenient for Bulking - This supplement is particularly beneficial for individuals in the bulking phase of their fitness journey. With a combination of whey protein and carbohydrates, it can help users meet their daily nutritional goals and support muscle growth.
Gluten Alert - It's important to note that the supplement may contain gluten due to the inclusion of fine oats.

PAS Nutrition AGF-1 Test Support Supplements for Men Supports with D-Aspartic Acid, L-Carnitine Tartrate, 30 Day Supply

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Why We Love It

Supports all training levels.
Trustworthy, drug-tested product.
Boosts peak performance.

Main Highlights

✔️ SUPPORT YOUR TRAINING - Designed by performance nutritionist working in elite sport since 2006. Developed to support elite athletes but now used by men of all ages and training levels to support their training.
✔️ TRUSTED BY SPORT- Every batch is tested under the Informed Sport program meaning its suitable for all athletes and also those subject to any drug testing in work, eg Armed Forces.
✔️ PROVIDING PEAK PERFORMANCE - Our 30-day supply bottle (240 capsules) assists men's health providing the capacity for peak performance - day-in, day-out! Whether it’s extra stamina for everyday living, building back strength in the gym or for extra male vitality. AGF-1 means more sets, more gains no matter your age - let us help you feel the way you want to feel.
✔️ “TRUST ME, IT WORKS” - SAM WARBURTON FORMER BRITISH AND IRISH LIONS CAPTAIN - I was a big fan of AGF-1 in pre season when looking to build muscle and now retired with the stress of young children I find it's a big help in keeping me in shape.
✔️ THE PAS NUTRITION PROMISE - We want you to enjoy our AGF-1 absolutely risk-free. Not satisfied? Just let us know and we'll be more than happy to offer you a 30-day MONEY BACK GUARANTEE. No questions asked.

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

Why We Love It

High-protein, low-fat mass gainer.
Comes in 6 appealing flavors.
Supports muscle growth and performance.

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

The Bulk Protein Company

The Bulk Protein Company, SERIOUS GAINZ - Whey Protein Powder - Weight Gain, Mass Gainer - 30g Protein Powders (Strawberry, 5kg)

20% OffFree Shipping

Why We Love It

Helps build and recover muscles.
Promotes weight gain healthily.
Offers great taste 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.

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

20% 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

Applied Nutrition Critical Mass Professional - Weight Gain Protein Powder, High Calorie Weight Gainer, Lean Mass (2.4kg - 16 Servings) (Chocolate)

27% 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.

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)

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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

8.7

Excellent

We scanned 1360 products

We reviewed these offers relevant to the Weight Gain Supplements For Men 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 Kinetica, The Bulk Protein Company, USN, OUT ANGLED, PAS, Optimum Nutrition, Applied Nutrition, 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 Weight Gain Supplements For Men in the market, we considered we took a deep dive into 6801 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 Kinetica Sports OatGain Weight Gainer - Raspberry Yoghurt Flavour | 630 Cal, 46g Protein & 82g Carbs/Serve, 15 Servings/2.4Kg | Optimum Grass Fed Protein Supplement | High Calorie & Easy Mixability. We love many things about this product by Kinetica. What sets it apart from the competition is Unrivalled taste and aroma, Easy to mix consistency, Boost energy, repair muscles.
The best value product for most shoppers and where user satisfaction is continuously the highest is Anabolic Gainz 5kg – Mass Gainer – 30g Protein Powder – Contains 3g Creatine Per Serving – Post Workout Recovery Fuel to Build Lean Muscle – 40 Servings – GMP Certified – TBPC (Chocolate) by The Bulk Protein Company based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Weight Gain Supplements For Men and the best cost-to-value ratio is Applied Nutrition Critical Mass Professional - Weight Gain Protein Powder, High Calorie Weight Gainer, Lean Mass (2.4kg - 16 Servings) (Chocolate)at Applied Nutrition with a 27% discount.
Our list of the best Weight Gain Supplements For Men 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 Weight Gain Supplements For Men in The UK

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We scanned 1360 products

We concluded that: