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Collection: Muscle Gain

Build size, strength and lean muscle with our premium muscle gain supplements at The Box Supplements. Whether you're looking for high-quality whey protein, mass gainers, creatine or intra-workout support, we stock trusted brands to help maximise muscle growth and recovery. Ideal for beginners and advanced lifters alike, our muscle-building range is designed to support progressive overload, improved recovery and consistent results. Shop muscle gain supplements in the UK with fast delivery and outstanding customer service.

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1792 products

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In stock 985
Out of stock 807

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The highest price is £236.99 From To

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10X Athletic 8
10x Athletic 8
Alpha Neon 20
Animal 9
Applied Nutrition 131
Atlas 12
Axe & Sledge 4
Barebells 15
Bio-Synergy 20
Biotech USA 43
Black Mamba 7
Bloom 4
BSN 13
Bulk 41
Cellucor 11
Chaos Crew 31
Chemical Warfare 16
CNP 73
Combat Fuel 15
Complete Strength 35
Conteh Sports 16
DY Nutrition 38
Efectiv Nutrition 31
EFX Sports 2
EHP Labs 14
Fulfil Nutrition 6
Gas Mark 10 18
Ghost 24
Go Fitness 2
Grenade 27
HIGH5 3
HR Labs 1
Hype 15
ICON Nutrition 4
JNX Sports 1
Little Dragon 1
Marchon 2
MARCHON 1
Marchon Supplements 6
Mars 7
MaxiNutrition 26
Muscle Moose 3
Mutant 54
MyProtein 56
Nutramino 6
NutriSport 111
Nuzest 12
Olimp Sport Nutrition 37
Optimum Nutrition 71
Outangled 18
Per4m 122
PharmaFreak 1
QNT 6
RedCon1 1
Refined Nutrition 60
Reflex Nutrition 35
Rich Piana 5% Nutrition 6
RYSE 2
SAN 1
Sci-MX 30
SCI-MX 3
Sci-Mx 1
Scitec Nutrition 25
Shaken Udder 6
SIS (Science In Sport) 2
Snickers 6
Soccer Supplement 8
Sport Asylum 10
Strom Sports 11
Sunna Supplements 1
SWOLE Lifestyle 8
The Protein Ball Co 3
The Skinny Food Co 4
The Ten Percent Club 1
Trained By JP 41
Trek 8
TWP 47
UFIT 17
Universal Nutrition 1
USN 75
Vilgain 36
Vitargo 4
VOW Nutrition 7
Vyomax Nutrition 8
Warrior 41
Whealth Nutrition 5
WheyBetter 2
XO Fitness 5
XTEND 3
Yummy Sports 10

Product type

All-In-One Gainer Powder 8
American Brands 2
Ashwagandha Capsules 4
Balls, Bars & Cookies 2
British Brands 70
Caffeine 1
Carbohydrate Powders 27
Clear Collagen Protein Powder 5
Clear Protein 2
Clear Whey Protein 2
Clear Whey Protein Isolate Powder 10
Clear Whey Protein Powder 9
Cognitive Support 2
Collagen 1
Convenience 36
Cream Of Rice 12
Cream of Rice Powder 6
Creatine 43
Creatine Capsules 2
Creatine Chews 5
Creatine CRE001 2
Creatine CRE002 3
Creatine Gummies 10
Creatine Powder 36
Creatine Tablets 1
Creatine Tablets & Capsules 1
Diet Whey Protein Powder 2
EAAs 6
Energy 3
Energy Drinks 3
Functional Foods 8
Gluten Free 3
Halal 5
Health and Wellbeing 1
HFSS Compliant 4
Hormone Support 1
Hydration 1
Informed Sport Approved 1
Mass Gainer 152
Meal Replacement Protein Powder 2
Meal Replacements 1
Other Amino Acids 2
Personal Care PER001 2
Plant Protein Powder 4
Post-Workout 13
Pre-Workout 4
Pre-Workout Capsules 1
Pre-Workout Powder 8
Pre-Workout With Caffeine 5
Protein Balls 4
Protein Bars 35
Protein Blend (Whey Protein Concentrate, Whey Protein Isolate, Calcium Caseinate, Micellar Casein, Milk Protein Isolate) Powder 10
Protein Blend Powder (Whey Protein Concentrate, Whey Protein Isolate, Calcium Caseinate, Micellar Casein, Milk Protein Isolate) 6
Protein Blondies 1
Protein Brownies 1
Protein Coffee Powder 3
Protein Cookies 5
Protein Croissants 2
Protein Dessert Powder 4
Protein Drinks 8
Protein Flapjacks 16
Protein Isolate 140
Protein Powder 103
Protein Powders 29
Protein Powders PRO001 2
Protein RTDs PRO009 1
Protein Samples 22
Protein Snacks 4
Protein Waffles 2
Protein_Powder 5
Ready To Go 11
Ready-To-Drinks 8
Recovery 10
Shots 1
Supplement 25
Testosterone Booster Capsules 6
Testosterone Boosters 3
Thermogenic & Fat Burners 7
Tribulus Capsules 1
Turkesterone 2
Vegan 2
Vegan Protein Powder 5
Vegan VEG001 1
Vegan Weight Gainer Powder 8
Vitamins & Minerals 3
Weight Gainer Powder 20
Weight Gainers 3
Whey Protein 536
Whey Protein Isolate Powder 61
Whey Protein Powder 117
Whey Protein Ready-to-Drinks 23
Zero Sugar 2

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Availability

In stock 985
Out of stock 807

Price

The highest price is £236.99 From To

From £

To £

Brand

10X Athletic 8
10x Athletic 8
Alpha Neon 20
Animal 9
Applied Nutrition 131
Atlas 12
Axe & Sledge 4
Barebells 15
Bio-Synergy 20
Biotech USA 43
Black Mamba 7
Bloom 4
BSN 13
Bulk 41
Cellucor 11
Chaos Crew 31
Chemical Warfare 16
CNP 73
Combat Fuel 15
Complete Strength 35
Conteh Sports 16
DY Nutrition 38
Efectiv Nutrition 31
EFX Sports 2
EHP Labs 14
Fulfil Nutrition 6
Gas Mark 10 18
Ghost 24
Go Fitness 2
Grenade 27
HIGH5 3
HR Labs 1
Hype 15
ICON Nutrition 4
JNX Sports 1
Little Dragon 1
Marchon 2
MARCHON 1
Marchon Supplements 6
Mars 7
MaxiNutrition 26
Muscle Moose 3
Mutant 54
MyProtein 56
Nutramino 6
NutriSport 111
Nuzest 12
Olimp Sport Nutrition 37
Optimum Nutrition 71
Outangled 18
Per4m 122
PharmaFreak 1
QNT 6
RedCon1 1
Refined Nutrition 60
Reflex Nutrition 35
Rich Piana 5% Nutrition 6
RYSE 2
SAN 1
Sci-MX 30
SCI-MX 3
Sci-Mx 1
Scitec Nutrition 25
Shaken Udder 6
SIS (Science In Sport) 2
Snickers 6
Soccer Supplement 8
Sport Asylum 10
Strom Sports 11
Sunna Supplements 1
SWOLE Lifestyle 8
The Protein Ball Co 3
The Skinny Food Co 4
The Ten Percent Club 1
Trained By JP 41
Trek 8
TWP 47
UFIT 17
Universal Nutrition 1
USN 75
Vilgain 36
Vitargo 4
VOW Nutrition 7
Vyomax Nutrition 8
Warrior 41
Whealth Nutrition 5
WheyBetter 2
XO Fitness 5
XTEND 3
Yummy Sports 10

Product type

All-In-One Gainer Powder 8
American Brands 2
Ashwagandha Capsules 4
Balls, Bars & Cookies 2
British Brands 70
Caffeine 1
Carbohydrate Powders 27
Clear Collagen Protein Powder 5
Clear Protein 2
Clear Whey Protein 2
Clear Whey Protein Isolate Powder 10
Clear Whey Protein Powder 9
Cognitive Support 2
Collagen 1
Convenience 36
Cream Of Rice 12
Cream of Rice Powder 6
Creatine 43
Creatine Capsules 2
Creatine Chews 5
Creatine CRE001 2
Creatine CRE002 3
Creatine Gummies 10
Creatine Powder 36
Creatine Tablets 1
Creatine Tablets & Capsules 1
Diet Whey Protein Powder 2
EAAs 6
Energy 3
Energy Drinks 3
Functional Foods 8
Gluten Free 3
Halal 5
Health and Wellbeing 1
HFSS Compliant 4
Hormone Support 1
Hydration 1
Informed Sport Approved 1
Mass Gainer 152
Meal Replacement Protein Powder 2
Meal Replacements 1
Other Amino Acids 2
Personal Care PER001 2
Plant Protein Powder 4
Post-Workout 13
Pre-Workout 4
Pre-Workout Capsules 1
Pre-Workout Powder 8
Pre-Workout With Caffeine 5
Protein Balls 4
Protein Bars 35
Protein Blend (Whey Protein Concentrate, Whey Protein Isolate, Calcium Caseinate, Micellar Casein, Milk Protein Isolate) Powder 10
Protein Blend Powder (Whey Protein Concentrate, Whey Protein Isolate, Calcium Caseinate, Micellar Casein, Milk Protein Isolate) 6
Protein Blondies 1
Protein Brownies 1
Protein Coffee Powder 3
Protein Cookies 5
Protein Croissants 2
Protein Dessert Powder 4
Protein Drinks 8
Protein Flapjacks 16
Protein Isolate 140
Protein Powder 103
Protein Powders 29
Protein Powders PRO001 2
Protein RTDs PRO009 1
Protein Samples 22
Protein Snacks 4
Protein Waffles 2
Protein_Powder 5
Ready To Go 11
Ready-To-Drinks 8
Recovery 10
Shots 1
Supplement 25
Testosterone Booster Capsules 6
Testosterone Boosters 3
Thermogenic & Fat Burners 7
Tribulus Capsules 1
Turkesterone 2
Vegan 2
Vegan Protein Powder 5
Vegan VEG001 1
Vegan Weight Gainer Powder 8
Vitamins & Minerals 3
Weight Gainer Powder 20
Weight Gainers 3
Whey Protein 536
Whey Protein Isolate Powder 61
Whey Protein Powder 117
Whey Protein Ready-to-Drinks 23
Zero Sugar 2

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Refined Nutrition Refined 100% Iso Whey Zero 908g Banana Smoothie

Regular price £32.99

Sale price £32.99 Regular price

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