10 Best Protein Shakes For Weight Gain in The UK

Last updated on 03/08/2025

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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

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

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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

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

The Bulk Protein Company

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

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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

Ensure NutriVigor Nutritional Shake – Strawberry Flavour – 850g – Food Supplement with Protein, HMB & 27 Vitamins & Minerals – Supports Strength, Energy & Immunity – With Vitamin D, C & B

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Why We Love It

Packed with 27 vital nutrients.
Promises 8.65 grams protein.
Offers delicious strawberry flavor.

Main Highlights

Nutritional supplement packed with 27 vitamins & minerals, Protein & HMB2
Includes blend of vitamin D, vitamin C, B vitamins & calcium
Helps support strength, energy§ levels, & immunity*
Feel stronger in 6 weeks^
From Ensure, the #1 nutritional supplement drink in the world
Ensure is a leading nutritional brand with 45 years of scientific evidence

Optimum Nutrition Gold Standard 100% Whey Muscle Building and Recovery Protein Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Banana Cream Flavour, 30 Servings, 900 g

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Why We Love It

Supports fitness journey from start.
Aids muscle gain and recovery.
Variety of sizes and 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

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

Ensure NutriVigor Nutritional Shake – Strawberry Flavour – 400g – Food Supplement with Protein, HMB & 27 Vitamins & Minerals – Supports Strength, Energy & Immunity – With Vitamin D, C & B

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Why We Love It

Packed with essential vitamins, minerals.
Delicious strawberry flavored shake.
High in protein content.

Main Highlights

Nutritional supplement packed with 27 vitamins & minerals, Protein & HMB2
Includes blend of vitamin D, vitamin C, B vitamins & calcium
Helps support strength, energy§ levels, & immunity*
Feel stronger in 6 weeks^
From Ensure, the #1 nutritional supplement drink in the world
Ensure is a leading nutritional brand with 45 years of scientific evidence

Premium Body Nutrition

Weight Gainer Cookies

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Why We Love It

High Protein content per serving.
Improved flavour enhances enjoyment.
Suitable for Vegetarians.

Main Highlights

PBN Weight Gainer Cookies 3kg Tub
Each serving contains 50g of Protein
New Improved flavour
Suitable for Vegetarians
Each Pack contains 9 Servings
PBN., Kemp House, 152 - 160 City Road, London, EC1V 2NX. / PBN, 20 Harcourt Street, Dublin 2, D02 H364.

UFIT High 50g Protein Shake - Banana Flavour - No Added Sugar - Low in Fat - Ready to Drink - Pack of 8 x 500 ml (Packaging May Vary)

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Why We Love It

High protein content boosts nutrition.
Low-fat and zero added sugars.
Boosts immunity with essential vitamins.

Main Highlights

No added sugar & fat free - Ufit contains no added sugar and is also fat free making it one super healthy shake
Directions: drink chilled, shake well
Added vitamins and minerals - Ufit contains essential vitamins and minerals that help keep immune system fighting fit

8.7

Excellent

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We scanned 928 products

We reviewed these offers relevant to the Protein Shakes For Weight Gain 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, Reflex, The Bulk Protein Company, NutriVigor, Myprotein, Premium Body Nutrition, UFIT, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Protein Shakes For Weight Gain in the market, we considered we took a deep dive into 4641 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 Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary. We love many things about this product by Optimum Nutrition. What sets it apart from the competition is Supports muscle growth and performance, Healthy, low-fat, high-calorie content, Six tasty, varied flavors.
The best value product for most shoppers and where user satisfaction is continuously the highest is Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Strawberry, 8 Servings, 2.73 kg, Packaging May Vary by Optimum Nutrition based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Protein Shakes For Weight Gain and the best cost-to-value ratio is Optimum Nutrition Gold Standard 100% Whey Muscle Building and Recovery Protein Powder With Naturally Occurring Glutamine and BCAA Amino Acids, Banana Cream Flavour, 30 Servings, 900 gat Optimum Nutrition with a 26% discount.
Our list of the best Protein Shakes For Weight Gain 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 Protein Shakes For Weight Gain in The UK

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We scanned 928 products

We concluded that: