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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 | Healthy Weight Gain Pills for Underweight Women & Men | Powerful Mass Gainer
US Store
Supragenix

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

1k+ bought

€ 72

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

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

600+ bought

€ 84

Naturade Weight Gain Nutrition Drink Mix for Healthy Weight Support, Balanced Calories with Protein, Vitamins & Minerals, Chocolate - 20.3 oz
US Store
Naturade

Naturade Weight Gain Nutrition Drink Mix for Healthy Weight Support, Balanced ...
4.1

600+ bought

€ 35

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

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

500+ bought

€ 44

Rule 1 Proteins Mass Gainer, Chocolate Fudge, 8 Servings | High-Calorie Weight Gain Formula with 1,220+ Calories, 250g+ Complex Carb Blend, 40g All-Whey Protein Per Serving
US Store
Rule 1 Proteins

Rule 1 Proteins Mass Gainer, Chocolate Fudge, 8 Servings | High-Calorie Weight Gain ...

400+ bought

€ 48

Smart Weight Gainer for Women Booty Pills, Curves & Shape Support for Healthy Weight Gain, Hips & Glutes Easy Alternative to Shakes 60 Pills with Aguaje, Pueraria Mirifica, Dong Quai & more
US Store
Jadee

Smart Weight Gainer for Women Booty Pills, Curves & Shape Support for Healthy ...
4.1

300+ bought

€ 28

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 Store
Jadee

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

200+ bought

€ 29

9% OFF
MuscleMeds Carnivor Mass Chocolate Big Steer 1250, 15 Lb Packaging May Vary
US Store
MuscleMeds

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

100+ bought

€ 129 142

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 Store
Clear-Biotic

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

50+ bought

€ 47

16% OFF
Nutrition Mass Pro High Protein Mass Gainer
US Store
G6 Sports

Nutrition Mass Pro High Protein Mass Gainer
4.5

50+ bought

€ 117 140

Core Nutritionals Grow Mass Gainer, Cookies N Cream, 10 Pounds | Mass Support, Muscle Support, 880 Calories, 50g Protein, Whole Food Carb Blend, Protein Blend, Maltodextrin Free Formula
US Store
Core Nutritionals

Core Nutritionals Grow Mass Gainer, Cookies N Cream, 10 Pounds | Mass Support, ...
5

€ 117

13% OFF
Nutrex Anabol Hardcore & Anabol Nighttime Muscle Builder Bundle
US Store
Nutrex Research

Nutrex Anabol Hardcore & Anabol Nighttime Muscle Builder Bundle
4.7

€ 77 89

11% OFF
Nutrex Research Anabol Stack | Anabol Hardcore, Anabol Ripped and Anabol Nighttime PM Bundle
US Store
Nutrex Research

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

€ 117 132

Core Nutritionals Grow Mass Gainer, Chocolate Peanut Butter Cup, 10 Pounds | Mass Support, Muscle Support, 880 Calories, 50g Protein, Whole Food Carb Blend, Protein Blend, Maltodextrin Free Formula
US Store
Core Nutritionals

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

€ 117

Labrada Nutrition Muscle Mass Gainer, Chocolate, 12 Pound
US Store
Labrada

Labrada Nutrition Muscle Mass Gainer, Chocolate, 12 Pound
4.2

€ 111

Ultimate Nutrition Muscle Juice Revolution 2600, Cookies N Cream, 11.1 lb | 70g Octo-PROTM Protein Blend, 170g Time-Release Carbs, 1000mg Glutamine, Low Sugar High Calorie Mass Gainer For Recovery
US Store
Ultimate Nutrition

Ultimate Nutrition Muscle Juice Revolution 2600, Cookies N Cream, 11.1 lb | 70g ...
4.5

€ 119

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

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

€ 20

9% OFF
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 | Carbohydrate Blend with KarboLyn, Healthy Carb Loading, More Energy, Faster Recovery, Muscle Builder, Weight Gainer for Men
US Store
SIRENLABS

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

€ 61 67

Fitness Health USN Hyperbolic Mass All-in-One Gainer Shake Powder, Chocolate, 6 kg
US Store
Fitness Health

Fitness Health USN Hyperbolic Mass All-in-One Gainer Shake Powder, Chocolate, 6 kg

€ 220

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

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

€ 53

Rule 1 Proteins Clean Gainer, Cookies & Creme, 30 Servings | High-Protein Lean Gain Formula with 560 Calories, 30g of Full-Spectrum Protein, Over 90g Carbs, Under 6g of Fat
US Store
Rule 1 Proteins

Rule 1 Proteins Clean Gainer, Cookies & Creme, 30 Servings | High-Protein Lean Gain ...
4.9

€ 78

6% OFF
ALLMAX QUICKMASS Mass Gainer Powder, Chocolate, 3.5 lb
US Store
ALLMAX

ALLMAX QUICKMASS Mass Gainer Powder, Chocolate, 3.5 lb
4.6

€ 50 53

11% OFF
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 Store
Goji Labs

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

€ 50 56

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

Gaspari Nutrition Real Mass Advanced Weight Gainer, Protein and Complex Carb Blend, ...
4.6

€ 94

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

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

€ 168

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

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

€ 168

Universal Nutrition UniversalNutritionAnimalMassSupplement,Vanilla
US Store
Universal Nutrition

Universal Nutrition UniversalNutritionAnimalMassSupplement,Vanilla
1

€ 18

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

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

€ 61

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

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

€ 95

Undefined Nutrition Gigantor Mass Gainer by Brian Shaw 60g Protein, 30 Servings, up to 790 Quality Calories Hardcore Hard Gainer Formula with 5- Phase Protein Blend 5.16 lbs, Chocolate
US Store
Undefined Nutrition

Undefined Nutrition Gigantor Mass Gainer by Brian Shaw 60g Protein, 30 Servings, up ...
5

€ 100

Endura Mass - 1 Kg Banana
US Store
Endura

Endura Mass - 1 Kg Banana
3.8

€ 64

8% OFF
Iron Vegan Athletes Gainer - Natural Chocolate 4.5 kg
US Store
IRONVEGAN

Iron Vegan Athletes Gainer - Natural Chocolate 4.5 kg
4

€ 129 140

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

Scitec mass 20 1750g vanilla by Scitec

€ 203

Ultimate Nutrition Muscle Juice 2544 Mass Gainer, Banana, 10.45 lb | 55g Protein Blend, 162g Carbs, 17g Fat, 1020 Calories, High Calorie Weight Gainer For Muscle Growth And Recovery
US Store
Ultimate Nutrition

Ultimate Nutrition Muscle Juice 2544 Mass Gainer, Banana, 10.45 lb | 55g Protein ...
4.3

€ 118

MuscleMeds Carnivor Mass - Vanilla Caramel
US Store
MuscleMeds

MuscleMeds Carnivor Mass - Vanilla Caramel
4.5

€ 68

4% OFF
NAKED Soy-Free Protein Bundle 8LB Vegan Mass and 2LB PB
US Store
NAKED

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

€ 102 106

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

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

€ 67

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.