Best Muscle Gain Supplements of 2025
Last updated on 27/09/2025
Advertising disclosure
Advertising disclosure
Best Choice
1
SERIOUS PROTEIN – Protein Powder – 4kg – Low Carb – Supports Lean Muscle Growth – Recovery Supplement - The Bulk Protein Company - 133 Servings (Cookies & Cream)
The Bulk Protein Company
25% OffFree Shipping
Show More
The Bulk Protein Company
SERIOUS PROTEIN – Protein Powder – 4kg – Low Carb – Supports Lean Muscle Growth – Recovery Supplement - The Bulk Protein Company - 133 Servings (Cookies & Cream)
25% OffFree Shipping
Why we love it
- Promotes muscle growth and recovery.
- Efficient for controlling calories.
- Impressive taste and value.
Main Highlights
- ✅ 24g PROTEIN PER SERVING TO BUILD LEAN MUSCLE - A convenient way to help meet your daily protein needs. Use after training to quickly heal micro-tears in muscle tissues, speed up recovery and reduce muscle soreness for STRONGER and BIGGER muscles over time.
- ✅ HIGH PROTEIN, LOW CALORIES, LOW CARBS - Only 114 Calories Per Serving! Serious Protein powder is 80% Protein with Low Carbs, Sugars, and Fats. Ideal for adding LEAN MASS! Perfect to use as a meal replacement or part of a calorie-controlled diet, while trying to lean out, or for those simply looking to support MUSCLE GAINS.
- ✅ HIGH QUALITY INGREDIENTS - Premium blend of Whey Protein Concentrate, Micellar Casein and Soy Protein Isolate, a combination of slow and fast releasing proteins for total protein synthesis throughout the day. Also contains GLUTAMINE PEPTIDE, essential for muscle recovery and more bioavailable than regular glutamine, helping aid MUSCLE GROWTH.
- ✅ PROTEIN SHAKE THAT TASTES GREAT - Add 1 rounded scoop (30g) to 250ml of cold water or skimmed milk and shake well to create a great tasting Protein Shake! Can also be enjoyed in smoothies, with oats or when added to a pancake mix. For best results consume 1 serving (30g) one to three times per day
- ✅ EXCELLENT VALUE - More than 6 weeks supply in one tub, when following our recommended servings. Comes with scoop for measurements.
Show More
Value for Money
2
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Strawberry, 8 Servings, 2.73 kg, Packaging May Vary
Optimum Nutrition
3% OffFree Shipping
Show More
Optimum Nutrition
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
Show More
3
Kinetica Sports OatGain Weight Gainer - Chocolate Caramel Flavour | 620 Cal, 47g Protein & 78g Carbs/Serve, 15 Serving/2.4Kg | Optimum Grass Fed Protein Supplement | High Calorie & Easy Mixability
Kinetica
Free Shipping
Show More
Kinetica
Kinetica Sports OatGain Weight Gainer - Chocolate Caramel Flavour | 620 Cal, 47g Protein & 78g Carbs/Serve, 15 Serving/2.4Kg | Optimum Grass Fed Protein Supplement | High Calorie & Easy Mixability
Free Shipping
Why we love it
- Delicious Chocolate Caramel Nut.
- Easy to mix.
- Repairs muscles, replenishes energy.
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.
Show More
4
The Bulk Protein Company, SERIOUS GAINZ - Whey Protein Powder - Weight Gain, Mass Gainer - 30g Protein Powders (Chocolate, 5kg)
The Bulk Protein Company
13% OffFree Shipping
Show More
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.
Show More
5
USN Muscle Fuel Anabolic All-In-One Muscle Mass Gainer, Banana Flavour - 2kg, 54g Protein Powder, 5g Creatine Powder & 5g BCAA Powder For Maximum Muscle Growth, Post Workout Recovery Drink Mix
USN
20% OffFree Shipping
Show More
USN
USN Muscle Fuel Anabolic All-In-One Muscle Mass Gainer, Banana 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
- Comprehensive all-in-one protein shake.
- Promotes physical performance and growth.
- Industry-leading sports nutrition brand.
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: Banana 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
Show More
6
HMB Pro 1,000mg & Vitamin D (Superior Absorption Formula) 120 HMB Capsules, Muscle Growth Supplements, Muscle Strength & Repair HMB Supplement
Insynergy Labs
Free Shipping
Show More
Insynergy Labs
HMB Pro 1,000mg & Vitamin D (Superior Absorption Formula) 120 HMB Capsules, Muscle Growth Supplements, Muscle Strength & Repair HMB Supplement
Free Shipping
Why we love it
- Optimal dosage for maximum results.
- Enhanced with Vitamin D benefits.
- Supports muscle growth and recovery.
Main Highlights
- HMB Pro by Insynergy Labs - We are proud to bring to market the leading HMB supplement in the UK. The first optimal dosage, ultra-premium grade HMB supplement enhanced with Vitamin D for results not seen in standalone HMB supplements.
- The UK's 1st HMB Supplement with Vitamin D- Studies show when Vitamin D is taken with HMB it helps to improve muscle health, growth and function even without exercise. The synergistic effects of these 2 compounds have a far superior effect compared to standard hmb supplements or hmb 500mg.
- Why HMB? - HMB has been shown to support lean muscle growth, muscle protection and repair, increased energy, fitness endurance and shorter recovery times. It also works to promote collagen production further supporting joints, flexibility and bone strength.
- Natural Amino Acid - HMB is made in the body from leucine, one of the bcaa amino acids. Our body's production of HMB declines with age, during calorie cutting or demanding exercise. Superior alternative to creatine, creatine tablets and regular amino acid nutritional supplements.
- Developed by INSYNERGY LABS - The UK’s Leading Nutraceutical Supplement Company backed by Science. HACCP, GMP and ISO 9001 manufacturing quality standards. Our products are vegan certified, gluten and lactose-free.
Show More
7
SCI-MX Total Mass - Advanced Muscle Mass Gainer Protein Powder - Muscle Growth & Weight Gain - Chocolate • 32g Protein + 478 Calories per Serving • 2kg
SCI-MX
Free Shipping
Show More
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
Show More
8
Extreme Weight Gain Anabolic & Appetite Stimulant Bundle – Weight Gainer for Women & Men - Fast Mass Gainer Supplement & Muscle Growth Pills – Made in The UK
OZUNA NUTRITION
Free Shipping
Show More
OZUNA NUTRITION
Extreme Weight Gain Anabolic & Appetite Stimulant Bundle – Weight Gainer for Women & Men - Fast Mass Gainer Supplement & Muscle Growth Pills – Made in The UK
Free Shipping
Why we love it
- Promotes rapid, healthy weight gain.
- Enhances appetite and nutrient absorption.
- Ideal for both genders.
Main Highlights
- WEIGHT GAIN & APPETITE STIMULANT BUNDLE: Our Extreme Weight Gain and Apt-Enhance bundle delivers a powerhouse combination for those looking to increase weight, muscle mass, boost appetite and overall caloric intake effectively.
- EXTREME WEIGHT GAIN SUPPORT: Crafted with Creatine Monohydrate, L-Leucine, and Glutamine, this potent formula supports muscle growth, strength, and quicker recovery. Designed with pure ingredients—free from additives, fillers, or binders—to help you achieve your mass-building goals.
- APT-ENHANCE APPETITE BOOSTER: Ozuna Apt-Enhance is formulated to stimulate appetite, improve digestion, and optimize nutrient absorption, making it easier to consume more calories. With science-backed ingredients, including Betaine HCl and Alfalfa to promote effective weight gain by increasing hunger and caloric intake.
- CONVENIENT HIGH-STRENGTH FORMULA: Featuring easy-to-swallow capsules and tablets packed with active ingredients, this bundle ensures powerful performance in a simple, convenient form.
- SUITABLE FOR ALL: Designed for both men and women, this bundle is vegetarian-friendly and manufactured in the UK to the highest quality standards.
Show More
9
Testosterone Booster for Men - Premium Testosterone Supplements - Test Boosters with Zinc & Magnesium, Supports Normal Testosterone Levels & Muscle - Male Supplement, 60 Days Supply - UK Formulated
Thermodrone
Free Shipping
Show More
Thermodrone
Testosterone Booster for Men - Premium Testosterone Supplements - Test Boosters with Zinc & Magnesium, Supports Normal Testosterone Levels & Muscle - Male Supplement, 60 Days Supply - UK Formulated
Free Shipping
Why we love it
- Enhanced testosterone support.
- Potent performance-boosting formula.
- Contains active, efficient ingredients.
Main Highlights
- Highly recommended by regular gym-goers: Our Testo-MX supplement supports testosterone levels & many areas of male performance alongside a balanced diet & exercise. Unlike low-grade supplements, our formula is packed with highly active ingredients, including bioactive vitamin D3.
- More testosterone stimulation: Our meticulously formulated formula has 900mg of d-aspartic acid (vs other supplements’ 200mg) to stimulate testosterone production. We also add fenugreek to help suppress estrogen conversion, along with T-boosting maca root and bioavailable zinc citrate.
- More potent formula for performance: Most brands rely on one energy booster or use quick-spike stimulants like caffeine. Our full-spectrum blend helps sustain energy for longer & aids muscle growth. We combine stimulating maca root, muscle-building magnesium & energising vitamin B6.
- Active Formula: We use only potent ingredients, like zinc citrate and vitamin D3, which is up to 2x more effective than vitamin D2 (ergocalciferol).
Show More
10
Anabolic Weight Gainer (XXXL) Capsules - Ultimate Formula for More Muscle, More Mass
Maverick Labs
Free Shipping
Show More
Maverick Labs
Anabolic Weight Gainer (XXXL) Capsules - Ultimate Formula for More Muscle, More Mass
Free Shipping
Why we love it
- Build muscle mass quickly.
- High-strength pharma-grade ingredients.
- Enhances strength and power.
Main Highlights
- If you want to start packing on as much serious muscle as is humanly possible (legally!), then our ANABOLIC GROWTH capsules are for you! You see, we’ve combined together THREE of the most powerful muscle-building anabolic growth agents known to man…all in one simple and easy-to-take pill!
- Who is this for? **** Anyone looking to gain serious muscle, as quickly as is humanly possible! *** Anyone looking to gain weight, size and genuine muscle mass! **** Anyone looking to increase strength and power!
- Contains three high-strength 'pharma-grade' ingredients that help build more mass quickly - Creatine Ethyl Ester, Anabolic Leucine and Instant 2:1:1 BCAAs
- Anyone can use these, but they must be used as part of a weight-training program to get the full effects
Show More