We Chose The Best Weight Gainer Shakes in The UK - 10/2025

SCI-MX Total Mass - Advanced Muscle Mass Gainer Protein Powder - Muscle Growth & Weight Gain - Chocolate • 32g Protein + 478 Calories per Serving • 2kg

SCI-MX Total Mass - Advanced Muscle Mass Gainer Protein Powder - Muscle Growth & Weight Gain - Chocolate • 32g Protein + 478 Calories per Serving • 2kg

SCI-MX

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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

9.0

Superb

9.0

Superb

SCI-MX

SCI-MX Total Mass - Advanced Muscle Mass Gainer Protein Powder - Muscle Growth & Weight Gain - Chocolate • 32g Protein + 478 Calories per Serving • 2kg

Free Shipping

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

We scanned 1608 products

We reviewed these offers relevant to the Weight Gainer Shakes 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, The Bulk Protein Company, Myprotein, Mutant, USN, Reflex, SCI-MX, 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 Gainer Shakes in the market, we considered we took a deep dive into 8041 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, Strawberry, 8 Servings, 2.73 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, Promotes recovery with carbohydrates, Offers tasty, diverse flavor options.

The best value product for most shoppers and where user satisfaction is continuously the highest is The Bulk Protein Company, SERIOUS GAINZ - Whey Protein Powder - Weight Gain, Mass Gainer - 30g Protein Powders (Chocolate, 5kg) by The Bulk Protein Company based on online reviews by bloggers, experts and online shoppers.

The biggest bargain at the moment for Weight Gainer Shakes and the best cost-to-value ratio is 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 Mixat USN with a 20% discount.

Our list of the best Weight Gainer Shakes 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.

Best Weight Gainer Shakes of 2025

We scanned 1608 products

We concluded that: