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Get The Best Weight Gain Supplements Online in New Zealand

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NAKED Chocolate Mass Gainer - All Natural Weight Gainer Protein Powder - 8lb Bulk, GMO Free, Gluten Free & Soy Free. No Artificial Ingredients - 1,360 Calories
US Store
NAKED

NAKED Chocolate Mass Gainer - All Natural Weight Gainer Protein Powder - 8lb Bulk, ...
4.4

2k+ bought

NZD 163

6% OFF
Nutrex Research Anabol Hardcore Anabolic Activator, Muscle Builder and Hardening Agent, 60 Pills Fast Acting Liquid Capsules - 1 Month Supply
US Store
Nutrex Research

Nutrex Research Anabol Hardcore Anabolic Activator, Muscle Builder and Hardening ...
4.3

2k+ bought

NZD 89 95

Optimum Nutrition Serious Mass Weight Gainer Protein Powder, Vanilla, 3LB
US Store
Optimum Nutrition

Optimum Nutrition Serious Mass Weight Gainer Protein Powder, Vanilla, 3LB
4.5

1k+ bought

NZD 82

25% OFF
NOW Foods Sports Nutrition, Carbo Gain Powder Maltodextrin, Rapid Absorption, Energy Production, 8-Pound
US Store
NOW

NOW Foods Sports Nutrition, Carbo Gain Powder Maltodextrin, Rapid Absorption, ...
4.6

1k+ bought

NZD 86 115

Animal M-Stak Anabolic Mass Gainer Bodybuilding Supplement | 21 Pill Packs
US Store
Animal

Animal M-Stak Anabolic Mass Gainer Bodybuilding Supplement | 21 Pill Packs
4.5

1k+ bought

NZD 113

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

CB-1 Weight Gainer Pills 90 Count | Clinically Tested Appetite Stimulant
4.1

1k+ bought

NZD 141

Transparent Labs Mass Gainer Protein Powder - Naturally Flavored Grass-Fed Whey w/ 53g Protein, 110g Carbs, High-Calorie Powder for Muscle Gain & Recovery, 3g Creatine - 15 Servings, Chocolate Glaze
US Store
Transparent Labs

Transparent Labs Mass Gainer Protein Powder - Naturally Flavored Grass-Fed Whey w/ ...
4.5

1k+ bought

NZD 185

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

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

800+ bought

NZD 361

14% OFF
Muscle Milk Gainer Protein Powder, Chocolate, 32g Protein, 5 Pound
US Store
Muscle Milk

Muscle Milk Gainer Protein Powder, Chocolate, 32g Protein, 5 Pound
4.5

700+ bought

NZD 107 124

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

700+ bought

NZD 86

Dymatize Super Mass Gainer Protein Powder, Rich Chocolate, 52g Protein, 1g Creatine, 1280 Calories, 10.7g BCAAs, 245g Carbs, Contains Whey_Protein Powder, Isolate, and Casein 16 Servings Pack of 2
US Store
Dymatize

Dymatize Super Mass Gainer Protein Powder, Rich Chocolate, 52g Protein, 1g ...
4.4

600+ bought

NZD 345

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

NZD 163

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

NZD 67

Jacked Factory Build-XT Daily Muscle Builder & Performance Enhancer - Muscle Building Supplement for Muscular Strength & Growth | Trademarked Ingredients Peak02, ElevATP, Astragin - 60 Veggie Pills
US Store
Jacked Factory

Jacked Factory Build-XT Daily Muscle Builder & Performance Enhancer - Muscle ...
4.2

500+ bought

NZD 75

Nutricost Mass Gainer Powder Double Chocolate 7 LBS, Gluten Free | 50 Grams of Protein Per Serving, GMO-Free
US Store
Nutricost

Nutricost Mass Gainer Powder Double Chocolate 7 LBS, Gluten Free | 50 Grams of ...
4.3

500+ bought

NZD 130

Optimum Nutrition Serious Mass Weight Gainer Protein Powder, Banana, 6LB
US Store
Optimum Nutrition

Optimum Nutrition Serious Mass Weight Gainer Protein Powder, Banana, 6LB
4.4

500+ bought

NZD 181

7% OFF
Optimum Nutrition Gold Standard Pro Gainer Protein, Vanilla Custard, 5 LB
US Store
Optimum Nutrition

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

500+ bought

NZD 204 220

Weight Gainer for Women Booty Pills, Curves, Hips, Glutes & Shape Support
US Store
Jadee

Weight Gainer for Women Booty Pills, Curves, Hips, Glutes & Shape Support
4.1

300+ bought

NZD 55

28% OFF
NOW Foods Sports Nutrition, Carbo Gain Powder Maltodextrin, Rapid Absorption, Energy Production, 12-Pound
US Store
NOW

NOW Foods Sports Nutrition, Carbo Gain Powder Maltodextrin, Rapid Absorption, ...
4.6

300+ bought

NZD 102 141

5% OFF
Weight Gaining Pills Dual Appetite Booster & Mass Enhancer, 56Ct
US Store
Rosamin

Weight Gaining Pills Dual Appetite Booster & Mass Enhancer, 56Ct
2.8

300+ bought

NZD 71 75

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

Nutricost Mass Gainer Powder Cookies N Cream 6.9 LBS, GMO-Free
4.1

300+ bought

NZD 130

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

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

300+ bought

NZD 93

Evogen Evolog Glucose Disposal Agent | Nutrient Partitioning | 60 Capsules
US Store
Evogen

Evogen Evolog Glucose Disposal Agent | Nutrient Partitioning | 60 Capsules
4.5

300+ bought

NZD 97

Mutant Mass Weight Gainer Protein Powder, Chocolate Fudge Brownie, 15 lb
US Store
Mutant

Mutant Mass Weight Gainer Protein Powder, Chocolate Fudge Brownie, 15 lb
4.5

200+ bought

NZD 207

Mutant Mass Weight Gainer Protein Powder, Chocolate Fudge Brownie, 5 lb
US Store
Mutant

Mutant Mass Weight Gainer Protein Powder, Chocolate Fudge Brownie, 5 lb
4.4

200+ bought

NZD 119

NutraBio Extreme Mass Gainer Protein Powder, 53G Protein, Clean Weight Gainer, Increase Muscle Mass, Full Spectrum Amino Acid - Chocolate, 6 Pound
US Store
NutraBio

NutraBio Extreme Mass Gainer Protein Powder, 53G Protein, Clean Weight Gainer, ...
4.5

200+ bought

NZD 159

Forzagen Lean Gainer Premium Mass Builder | Mass Gainer Protein Powder for Men & Women | High Calorie Protein, Weight Gain, Bulk, Muscle Building Supplement | Dutch Chocolate, 12 lbs. 16+ Servings
US Store
Forzagen

Forzagen Lean Gainer Premium Mass Builder | Mass Gainer Protein Powder for Men & ...
4.4

200+ bought

NZD 167

Ronnie Coleman Signature Series King Mass XL Protein Powder, Weight and Muscle Gainer, 60g Protein, 180g Carbohydrates, 1,000+ Calories Per Serving, Creatine and Glutamine, Chocolate, 6 lb
US Store
Ronnie Coleman Signature Series

Ronnie Coleman Signature Series King Mass XL Protein Powder, Weight and Muscle ...
4.3

200+ bought

NZD 118

Genius Muscle Health Supplement, Strawberry Vanilla, 30 Servings | Non-Hormonal Muscle Support for Growth, Endurance and Recovery with 6 Organic Mushrooms, Naturally Sweetened
US Store
The Genius Brand

Genius Muscle Health Supplement, Strawberry Vanilla, 30 Servings | Non-Hormonal ...
4.3

100+ bought

NZD 207

RIVAL NUTRITION Clean Gainer Protein Powder Chocolate Fudge, 10 lb | High Protein Lean Gainer, 580 Quality Calories, 30g Protein, 101g Multi-Source Carbs, Natural Flavors, Clean Ingredients
US Store
Rivalus

RIVAL NUTRITION Clean Gainer Protein Powder Chocolate Fudge, 10 lb | High Protein ...
4.6

100+ bought

NZD 163

1200MG Beta Ecdysterone Supplement, 98% Maximum Purity Ecdysterone, 60 Cap
US Store
Thalacy

1200MG Beta Ecdysterone Supplement, 98% Maximum Purity Ecdysterone, 60 Cap
4.3

100+ bought

NZD 58

5% OFF
Natural Endurance and Oxygen Supplement to Help VO2 max w/Rhodiola Rosea, B12, and Alpha Lipoic Acid 120 Capsules 30 Day Supply
US Store
VO2-Boost

Natural Endurance and Oxygen Supplement to Help VO2 max w/Rhodiola Rosea, B12, and ...
4.3

100+ bought

NZD 109 115

BSN True-Mass Weight Gainer, 41 Ratio, Vanilla Ice Cream, 15 Servings | Muscle Mass Gainer with Whey and Casein Protein for Post-Workout Recovery, Endurance and Lean Muscle Growth
US Store
BSN

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

100+ bought

NZD 200

Project AD Matador Muscle Builder Enhances Muscle Pumps and Promotes Muscle Growth and Energy 60 Capsules
US Store
PROJECT AD LLC

Project AD Matador Muscle Builder Enhances Muscle Pumps and Promotes Muscle Growth ...
4.4

100+ bought

NZD 119

Mutant Mass Weight Gainer Protein Powder, Cookies & Cream, 5 lb
US Store
Mutant

Mutant Mass Weight Gainer Protein Powder, Cookies & Cream, 5 lb
4.2

100+ bought

NZD 116

Booty Gainer Pro Series - Weight/Muscle Gainer for Women to Grow Thicker Booty & Larger Buttox | Helps Naturally Curve & Shape Body | Grow Rounder, Wider & Thicker Glutes - 60 Capsules
US Store
EPN Supplements

Booty Gainer Pro Series - Weight/Muscle Gainer for Women to Grow Thicker Booty & ...
4.2

100+ bought

NZD 97

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

100+ bought

NZD 55

G6 Mass Pro High Protein Gainer Chocolate
US Store
G6 Sports

G6 Mass Pro High Protein Gainer Chocolate
4.5

50+ bought

NZD 273

Serious Mass Strawberry Weight Gain Protein Powder | 12 lbs
US Store
Optimum Nutrition

Serious Mass Strawberry Weight Gain Protein Powder | 12 lbs
4.2

50+ bought

NZD 254

Ronnie Coleman Signature Series King Mass XL Mass Gainer Protein Powder, Muscle Gainer, 60g Protein, 180g Carbohydrates, 1,000+ Calories, Creatine and Glutamine, Cookies N Cream, 15 Pound
US Store
Ronnie Coleman Signature Series

Ronnie Coleman Signature Series King Mass XL Mass Gainer Protein Powder, Muscle ...
4.5

50+ bought

NZD 207

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

50+ bought

NZD 291

Rule 1 Proteins Clean Gainer, Vanilla Ice Creme, 15 Servings
US Store
Rule 1 Proteins

Rule 1 Proteins Clean Gainer, Vanilla Ice Creme, 15 Servings
4.6

50+ bought

NZD 108

15% OFF
PEScience Smart Mass Gainer, Gourmet Chocolate, 14 Packets | Lean Muscle Weight Gainer, Whey Protein & Casein Protein Blend, Slow-Digesting Carbs, Maltodextrin-Free
US Store
PEScience

PEScience Smart Mass Gainer, Gourmet Chocolate, 14 Packets | Lean Muscle Weight ...
4.8

50+ bought

NZD 64 75

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

NZD 91

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

NATURADE Sugar Free Weight Gain Powder, 20.3 OZ
4.4

50+ bought

NZD 75

MuscleMeds Carnivor Mass Diet Supplement, Vanilla Caramel, 5.78 Pound 002658
US Store
MuscleMeds

MuscleMeds Carnivor Mass Diet Supplement, Vanilla Caramel, 5.78 Pound 002658
4.4

50+ bought

NZD 133

Its Just! - Mass Gainer Powder, 100% Maltodextrin Complex Carbohydrates, Sustained Energy, Rapid Absorption, Non-GMO, Easily Add to Any Protein Shake, 3lbs / 38 Servings
US Store
It's Just!

Its Just! - Mass Gainer Powder, 100% Maltodextrin Complex Carbohydrates, Sustained ...
4.4

50+ bought

NZD 64

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

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

50+ bought

NZD 141

Shop Premium Weight Gain Supplements Online with Ubuy New Zealand

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 New Zealand 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.