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Get The Best Weight Gain Supplements Online in Belgium

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CB-1 Weight Gainer Pills 90 Count | Clinically Tested Appetite Stimulant
US Boutique
Supragenix

CB-1 Weight Gainer Pills 90 Count | Clinically Tested Appetite Stimulant
4.2

1k+ acheté

€ 72

Optimum Nutrition Gold Standard Pro Gainer Protein, Double Chocolate, 10 LB
US Boutique
Optimum Nutrition

Optimum Nutrition Gold Standard Pro Gainer Protein, Double Chocolate, 10 LB
4.6

800+ acheté

€ 185

NutraBio CarboMax Maltodextrin Powder - Carbohydrate Powder for Sustained Energy - Calorie Rich for Muscle and Weight Gain - Unflavored - 5 Pounds, 75 Servings
US Boutique
NutraBio

NutraBio CarboMax Maltodextrin Powder - Carbohydrate Powder for Sustained Energy - ...
4.5

700+ acheté

€ 44

NAKED Vegan Mass - Chocolate Vegan Weight Gainer - 1,280 Calories, Non-GMO, Soy & Gluten Free, No Artificial Ingredients - 8LB Bulk - 11 Servings
US Boutique
NAKED

NAKED Vegan Mass - Chocolate Vegan Weight Gainer - 1,280 Calories, Non-GMO, Soy & ...
4.2

600+ acheté

€ 95

7% de remise
Optimum Nutrition Gold Standard Pro Gainer Protein, Vanilla Custard, 5 LB
US Boutique
Optimum Nutrition

Optimum Nutrition Gold Standard Pro Gainer Protein, Vanilla Custard, 5 LB
4.6

500+ acheté

€ 105 113

Nutricost Mass Gainer Powder Cookies N Cream 6.9 LBS, GMO-Free
US Boutique
Nutricost

Nutricost Mass Gainer Powder Cookies N Cream 6.9 LBS, GMO-Free
4.2

400+ acheté

€ 67

Rule 1 Proteins Mass Gainer, Chocolate Fudge, 8 Servings
US Boutique
Rule 1 Proteins

Rule 1 Proteins Mass Gainer, Chocolate Fudge, 8 Servings
4.4

300+ acheté

€ 48

Curves Weight Gainer for Women - Shape Support Hips & Butt Enhancer Pills
US Boutique
Jadee

Curves Weight Gainer for Women - Shape Support Hips & Butt Enhancer Pills
4.1

200+ acheté

€ 28

8% de remise
Weight Gaining Pills Dual Appetite Booster & Mass Enhancer, 56Ct
US Boutique
Rosamin

Weight Gaining Pills Dual Appetite Booster & Mass Enhancer, 56Ct
2

200+ acheté

€ 36 39

Protein My New Silueta Gainer Siluette Pro Helps Recover BBL Volume vainilla
US Boutique
MI NUEVA SILUETA

Protein My New Silueta Gainer Siluette Pro Helps Recover BBL Volume vainilla
4.9

100+ acheté

€ 127

GNC Pro Performance Weight Gainer, Vanilla Ice Cream, 32.5 Oz, 5 Servings
US Boutique
GNC

GNC Pro Performance Weight Gainer, Vanilla Ice Cream, 32.5 Oz, 5 Servings
5

100+ acheté

€ 50

BBL Gummies for Womens Curves - Weight Gainer for Women with Aguaje, Pueraria Mirifica & Fenugreek | Bigger Butt Growth & Hips Enhancement Booty Gummies, Curves & Feminine Weight Gain 60 Gummies
US Boutique
Jadee

BBL Gummies for Womens Curves - Weight Gainer for Women with Aguaje, Pueraria ...
4.1

100+ acheté

€ 29

BSN True-Mass Weight Gainer, 41 Ratio, Vanilla Ice Cream, 15 Servings
US Boutique
BSN

BSN True-Mass Weight Gainer, 41 Ratio, Vanilla Ice Cream, 15 Servings
4.5

100+ acheté

€ 104

Its Just! - Mass Gainer Powder, 100% Maltodextrin, 3lbs / 38 Servings
US Boutique
It's Just!

Its Just! - Mass Gainer Powder, 100% Maltodextrin, 3lbs / 38 Servings
4.5

50+ acheté

€ 33

MuscleMeds Carnivor Mass Chocolate Big Steer 1250, 15 Lb Packaging May Vary
US Boutique
MuscleMeds

MuscleMeds Carnivor Mass Chocolate Big Steer 1250, 15 Lb Packaging May Vary
4.3

50+ acheté

€ 149

PEScience Smart Mass Gainer, Gourmet Chocolate, 14 Packets
US Boutique
PEScience

PEScience Smart Mass Gainer, Gourmet Chocolate, 14 Packets
4.8

50+ acheté

€ 33

Rule 1 Proteins Clean Gainer, Chocolate Fudge, 15 Servings
US Boutique
Rule 1 Proteins

Rule 1 Proteins Clean Gainer, Chocolate Fudge, 15 Servings
4.5

50+ acheté

€ 56

G6 Mass Pro High Protein Gainer Chocolate
US Boutique
G6 Sports

G6 Mass Pro High Protein Gainer Chocolate
4.5

50+ acheté

€ 140

Weight Gainer B-12 Chewable Absorbs Faster Than Weight Gain Pills for Fast Massive Weight Gain in Men and Women While Opening Your Appetite More Than Protein
US Boutique
Clear-Biotic

Weight Gainer B-12 Chewable Absorbs Faster Than Weight Gain Pills for Fast Massive ...
3.7

50+ acheté

€ 47

5% Nutrition BiggerByTheDay Anabolic Muscle Builder & Hardcore Mass Gainer
US Boutique
5% Nutrition

5% Nutrition BiggerByTheDay Anabolic Muscle Builder & Hardcore Mass Gainer
4.1

50+ acheté

€ 72

NATURADE Sugar Free Weight Gain Powder, 20.3 OZ
US Boutique
Naturade

NATURADE Sugar Free Weight Gain Powder, 20.3 OZ
4.4

50+ acheté

€ 39

21% de remise
Hunger+ Appetite Stimulant for Weight Gain Natural Appetite Booster for Men & Women, Stimulant-Free, 750mg L-Leucine + 9 Disclosed Actives, Made in USA, Third-Party Tested
US Boutique
Goji Labs

Hunger+ Appetite Stimulant for Weight Gain Natural Appetite Booster for Men & ...
4.1

€ 44 56

BodyTech Prime Mass - High-Calorie Mass Gainer - Supports Muscle Growth & Weight Gain - Chocolate 12 lb, 17 Servings
US Boutique
BodyTech

BodyTech Prime Mass - High-Calorie Mass Gainer - Supports Muscle Growth & Weight ...
4.2

€ 129

Scitec mass 20 1750g vanilla by Scitec
US Boutique
Scitec Nutrition

Scitec mass 20 1750g vanilla by Scitec

€ 203

GNC Pro Performance Weight Gainer, Double Chocolate, 32.7 Oz, 5 Servings
US Boutique
GNC

GNC Pro Performance Weight Gainer, Double Chocolate, 32.7 Oz, 5 Servings

€ 44

Ultimate Nutrition Muscle Juice 2544 Mass Gainer, Banana, 4.96 lb
US Boutique
Ultimate Nutrition

Ultimate Nutrition Muscle Juice 2544 Mass Gainer, Banana, 4.96 lb
4.2

€ 70

11% de remise
Nutrex Anabol Hardcore & Anabol Nighttime Muscle Builder Bundle
US Boutique
Nutrex Research

Nutrex Anabol Hardcore & Anabol Nighttime Muscle Builder Bundle
4.7

€ 77 87

6% de remise
ALLMAX QUICKMASS Mass Gainer Powder, Chocolate, 3.5 lb
US Boutique
ALLMAX

ALLMAX QUICKMASS Mass Gainer Powder, Chocolate, 3.5 lb
4.6

€ 50 53

NAKED Mass Protein 8LB - EAAs 50 Servings - BCAAs 100 Servings Bulk; Vegan; Non-GMO; Gluten Free; Soy Free
US Boutique
NAKED

NAKED Mass Protein 8LB - EAAs 50 Servings - BCAAs 100 Servings Bulk; Vegan; ...

€ 168

PERFECT SPORTS Hulk Mass Gainer, Chocolate Ice Cream, 5 lb
US Boutique
PERFECT SPORTS

PERFECT SPORTS Hulk Mass Gainer, Chocolate Ice Cream, 5 lb
3

€ 61

9% de remise
Siren Labs Ultra Karbs Mass Gainer Post Workout Muscle Builder Healthy Carb Loading - Carbohydrate Blend with KarboLyn - More Energy, Faster Recovery - Weight Gainer for Men 40 Servings
US Boutique
SIRENLABS

Siren Labs Ultra Karbs Mass Gainer Post Workout Muscle Builder Healthy Carb Loading ...
4.7

€ 61 67

Endura Mass - 1 Kg Banana
US Boutique
Endura

Endura Mass - 1 Kg Banana
3.7

€ 64

Gaspari Nutrition Real Mass Advanced Weight Gainer, Protein and Complex Carb Blend, 50g Protein, 16g EAAs, Gluten-Free, 12 lbs Chocolate Ice Cream
US Boutique
Gaspari Nutrition

Gaspari Nutrition Real Mass Advanced Weight Gainer, Protein and Complex Carb Blend, ...
4.4

€ 94

Iron Vegan Athletes Gainer - Natural Chocolate 4.5 kg
US Boutique
IRONVEGAN

Iron Vegan Athletes Gainer - Natural Chocolate 4.5 kg
4

€ 129

Ultimate Nutrition Muscle Juice Revolution 2600, Vanilla Creme, 11.1 lb
US Boutique
Ultimate Nutrition

Ultimate Nutrition Muscle Juice Revolution 2600, Vanilla Creme, 11.1 lb
4.5

€ 118

Ronnie Coleman Signature Series King Mass XL, Vanilla Ice Cream, 2.75kg
US Boutique
Ronnie Coleman Signature Series

Ronnie Coleman Signature Series King Mass XL, Vanilla Ice Cream, 2.75kg
4.2

€ 53

NAKED Chocolate Peanut Butter Mass Protein 8LB - EAAs 50 Servings - BCAAs 100 Servings Bulk; Vegan; Non-GMO; Gluten Free; Soy Free
US Boutique
NAKED

NAKED Chocolate Peanut Butter Mass Protein 8LB - EAAs 50 Servings - BCAAs 100 ...

€ 168

PERFECT SPORTS Hulk Mass Gainer, 50g Protein, Vanilla Ice Cream, 5 lb
US Boutique
PERFECT SPORTS

PERFECT SPORTS Hulk Mass Gainer, 50g Protein, Vanilla Ice Cream, 5 lb
4

€ 61

10% de remise
Nutrex Research Anabol Stack | Anabol Hardcore, Anabol Ripped and Anabol Nighttime PM Bundle
US Boutique
Nutrex Research

Nutrex Research Anabol Stack | Anabol Hardcore, Anabol Ripped and Anabol Nighttime ...
5

€ 117 130

Core Nutritionals Grow Mass Gainer, Chocolate Peanut Butter Cup, 10 Pounds
US Boutique
Core Nutritionals

Core Nutritionals Grow Mass Gainer, Chocolate Peanut Butter Cup, 10 Pounds
4.6

€ 117

swiig Mass Chocolate - 10lb
US Boutique
swiig

swiig Mass Chocolate - 10lb

€ 160

Hip BBL Gummies for Women Body, 60 Booty Gummies Blend with Vitamin C & Zinc
US Boutique
Siyolaherb

Hip BBL Gummies for Women Body, 60 Booty Gummies Blend with Vitamin C & Zinc
4

€ 20

BodyTech Prime Mass Weight Gainer, Vanilla, 55g Protein, 12 lb
US Boutique
BodyTech

BodyTech Prime Mass Weight Gainer, Vanilla, 55g Protein, 12 lb
4.4

€ 129

BodyTech Prime Mass - Vanilla 6 lbs./8 Servings
US Boutique
BodyTech

BodyTech Prime Mass - Vanilla 6 lbs./8 Servings
3.9

€ 67

BodyTech Prime Mass - High-Calorie Mass Gainer - Supports Muscle Growth & Weight Gain - Chocolate 6 lb, 8 Servings
US Boutique
BodyTech

BodyTech Prime Mass - High-Calorie Mass Gainer - Supports Muscle Growth & Weight ...
4.8

€ 61

5% de remise
ALMASED de proteina en polvo, batido natural de reemplazo de comidas y suplemento para perdida de peso hombres y mujeres, proteina para bajar de peso, soporte de suplemento de GLP-1 y apoya la salud h
US Boutique
Almased

ALMASED de proteina en polvo, batido natural de reemplazo de comidas y suplemento ...

€ 143 151

NAKED Soy-Free Protein Bundle 8LB Vegan Mass and 2LB PB
US Boutique
NAKED

NAKED Soy-Free Protein Bundle 8LB Vegan Mass and 2LB PB
3.7

€ 112

Shop Premium Weight Gain Supplements Online with Ubuy Belgium

For many, the fitness journey is focused on shedding pounds, but a significant portion of the population faces the exact opposite challenge: putting on mass. Whether you possess a highly active metabolism, lead an intensely busy lifestyle that causes you to miss meals, or are an athlete looking to bulk up, gaining healthy weight requires a consistent caloric surplus. This is where a reliable weight gain supplement steps in as your silent hero.

Purchasing your supplements online from Ubuy Belgium grants you access to a premium, globally sourced catalogue. Situated perfectly within the broader health & supplements category, these products offer a world of high-quality macronutrients, complex carbohydrates, and essential vitamins designed to nourish your body and promote sustainable growth.

Explore Different Types of Weight Gain Supplements

Just as every individual's body is different, the weight gain supplements available today come in highly versatile, targeted formulations. Gone are the days of one size fits all, chalky drinks. Modern nutrition science provides high potency solutions for rapid bulking, cleaner formulations for lean muscle, and gentle options tailored for different age groups and genders. Here at our collection there are many branded weight management supplement options available to pick out from. Think of this as selecting the precise nutritional fuel your body demands to thrive.

The Heavyweight Champions (For Men and Hardgainers)

For those who naturally struggle to put on mass, standard meals simply aren't enough to tip the scales. A high-quality mass gainer protein powder is built for this exact scenario. Packed with upwards of 1,000 calories per serving, these formulas combine fast-acting whey protein with complex carbohydrates to fuel rigorous training sessions and accelerate recovery.

If you are hunting for the best weight gain supplements for skinny guys, you need a product that delivers a massive caloric punch without unnecessary fillers. Brands like MuscleTech and Dymatize lead the charge here, offering robust weight gain supplements for men that stimulate muscle protein synthesis while replenishing glycogen stores. They are the ultimate ally for gym-goers, athletes, and anyone tired of hitting a plateau.

Balanced Nourishment (For Women)

While men often seek sheer size, women typically look for lean muscle development, enhanced curves, and healthy weight restoration without feeling overly bloated. Weight gain supplements for women are specially formulated to meet these precise needs.

These variants generally offer a more moderate caloric surplus—focusing heavily on premium protein sources, digestive enzymes, and added vitamins for hair, skin, and bone health. They seamlessly blend into morning smoothies or post-pilates shakes, providing a clean, sustained energy release that supports your fitness goals whilst keeping you feeling vital and strong.

Gentle Nutrition (For Children)

Sometimes, children struggle to maintain a healthy growth curve due to being fussy eaters, having high activity levels, or navigating medical challenges. In these sensitive cases, weight gain supplements for kids offer a brilliant solution.

These formulas are distinctly different from sports nutrition products. They are fortified with essential vitamins, minerals, and healthy fats necessary for brain and bone development, masking vital nutrients behind delicious, kid-friendly flavours. Always consult with a paediatrician before introducing any new nutritional programme to a child's diet.

A Reddit User r/ADHDparenting asking about weight gain supplements for child

We’ve been doing this for most of my 6 years olds life. We get carnation chocolate milk in the tub, and put 3 heaping tablespoons of the carnation in a cup. Pour several tablespoons of heavy cream over it (start with 1 and see where he balks at the taste after you try it a few times. Then pour around 6 oz of milk over it and use a frother to mix it up. He feels like it’s regular chocolate milk and it gets him an extra 400 calories or so.

Source: r/ADHDparenting (Reddit)

Clean and Premium Blends (For the Health-Conscious)

If your primary concern is the quality of your calories, finding the best weight gainer comes down to ingredient transparency. Clean weight gain powder options eschew artificial sweeteners, dyes, and cheap maltodextrin in favour of whole food carbohydrate sources like sweet potato, oats, and grass-fed protein.

Transparent Labs is renowned for this approach, providing some of the best weight gain supplements on the market for those who want to bulk up without compromising their gut health or dietary ethos. Paired with a trusted favourite like Optimum Nutrition, these products ensure that every extra calorie you consume serves a functional, healthy purpose.

Weight Gain Supplement Picks 2026

To help you navigate your choices, explore our top picks for 2026, featuring innovative formulas tailored for varying needs, from hardcore bulking to clean, everyday nutritional support.

Product 

Brand

Best For

Why It Stands Out

Serious Mass Gainer

Optimum Nutrition

Reliable, clean bulking

The industry standard; offers a high protein to carb ratio (1:5) with 25+ added vitamins and minerals.

Mass Gainer

Transparent Labs

Health conscious athletes

100% grass fed whey, zero artificial sweeteners, colours, preservatives and whole food carbohydrate sources.

Super Mass Gainer

Dymatize

Hardgainers & skinny guys

Exceptionally high calorie count per serving with incredibly rich, dessert-like flavours.

Cell Tech

MuscleTech

Intense muscle growth

Scientifically backed formulas are often infused with creatine to maximise strength alongside size.

Frequently Asked Questions About Weight Gain Supplements

  • How long does a weight gainer take to see results?

    Results are highly dependent on your overall diet and training regimen. However, if you are consistently in a caloric surplus while using a weight gainer, you can generally expect to see noticeable changes on the scale within 2 to 4 weeks.

  • Can weight gain supplements improve my weight?

    Yes, absolutely. To gain weight, you must consume more calories than you burn. These supplements provide a highly convenient, liquid form of dense calories and nutrients, making it significantly easier to hit that required surplus without feeling uncomfortably full.

  • What should I consider before buying a weight gain supplement?

    You should evaluate your specific goals, dietary restrictions, and current caloric intake. Look closely at the macronutrient profile (ratio of protein to carbohydrates to fats) and check the ingredient list to ensure it aligns with your digestive tolerance. Avoid products heavily reliant on added sugars.

  • How do I choose the right weight gain supplement?

    Start by identifying your category. If you have a very fast metabolism, a heavy-duty mass gainer protein powder is ideal. If you are a woman looking for lean curves, opt for targeted weight gain supplements for women. Always prioritise brands that utilise third-party testing and transparent labelling for the safest and most effective results.