nzprotein mass gainer 1kg with green

Mass Gainer 1kg

A Big Thick-Shake for Mass Gain, a Treat, or Post Exercise Recovery.




$35.00 (NZD)

Mass Gainer NZ

Mass gainers are higher calorie than regular protein shakes so they're suitable for supporting mass gain.

The extra calories may also be beneficial for post exercise recovery as they can provide an extra boost of energy.

We've developed this product a little differently though...

All of our other protein powders are so clean that we thought we'd develop one that can be used as a cheat-shake treat as well. (Don't worry, we won't tell anyone).

It's a bit bad, but it's really good! And we've done it this way on purpose.

Our mass gainer protein is a big thick-shake. But a real thick-shake - the kind you get at your favourite burger shop. It's seriously big.

It's mandatory, therefore, to mix this product with ice cold water or milk.

You'll want to make sure that you have a big shaker too. Our Wave XL shaker is the best for this because each serving is 100 grams.

image of thickshake

Mass Gainer Vs Whey

The main difference between mass gainers and whey protein shakes is that mass gainers have more calories.

The extra calories may be beneficial for those who have a difficult time building and maintaining mass.

It can also be used as a post exercise recovery shake.

Whey is a great muscle building protein because it provides a concentrated amount of amino acids and branched chain amino acids that are suited to muscle growth and repair.

Whey also digests quickly so is a good protein source for times when the body may be depleted, such as post exercise.

Great news then - our mass gainer product contains most of its protein from whey.

Our mass gainer also has milk powder which digests slower than whey. This product therefore has a blend of fast acting and slow digesting milk proteins to provide fuel for longer.


mass gainer small bag

nz whey protein small bag

Main Attribute

Has more calories than whey.

Better tasting. A real thickshake - like the kind you get at your burger shop.

Clean muscle building protein, fast digesting.

Best For

Mass gain, a treat, or post exercise recovery.

Times when the body may be depleted, such as post exercise.

Mixes Easily

Needs to be mixed in ice cold water or milk. Mixes easily in a large shaker.

Mixes easily in water, milk, or your favourite liquid without lumps.

Great Tasting


The best tasting - exceeds 5 stars. Contains starch to make it a real thickshake.


Clean tasting and has a natural creamy texture. No added thickeners to modify the texture.


Depending on your nutritional requirements take 1-2 servings daily. Post workout is a good time to consume our mass gainer.

Depending on your nutritional requirements take 1-3 servings daily at breakfast, between meals, post workout, or before bed.

Speed of Digestion

starstarstarhalf star

Fast and slow digesting.

starstarstarstarhalf star

Fast digesting.


We do not stock samples of this product as the serving size is 100 grams and too large.

We stock samples of our WPC samples here. Each sachet is one serving.


There are 10 servings in the 1kg pouch, with a cost per serve of over $3. It's worth noting that each serve is a huge 100 grams.

This cost decreases when bought in bulk.

There are 32 servings in the 1kg pouch, with a cost per serve of just over $1.

Larger economical pack sizes are available too.

Please note that this product is processed in a facility that also handles egg, soy, peanut, and gluten ingredients.

Rated 4.53/5 Based on 40 customer reviews.

Place a Review on this product

Great product . . Would like to order more
Review by: Anonymous on Thu, Feb 29, 2024 9:28 AM
Sadly this was to hard in my tummy and I had to return. NZ Protein were amazing and did everything they could to help me.
Review by: Anonymous on Tue, Feb 27, 2024 1:03 PM
Seems very good . Works well
. I will bye more
Review by: John on Sun, Feb 25, 2024 11:58 AM
Still early days but it's going down well and I feel great
Review by: Anonymous on Sat, Jan 13, 2024 1:38 PM
Im happy with the product as after being very sick and losing a lot of weight I have so far gained 3 kgs. Things are moving at last. Thank you - its a good product.
Review by: Jean on Wed, Jan 3, 2024 4:33 PM
Tasy but too sweet. Im trying to gain weight but so far only 2 kgs
Review by: Jean on Mon, Nov 13, 2023 4:53 PM
Mixes so well and is the best tasting protein shake I've tried to date. Was a bit worried about it being a thicker drink but it's yum!
Review by: Reg on Thu, Nov 2, 2023 1:52 PM
Very quick delivery. Bought vanilla mass gainer, very sweet but can just adjust water levels for this. All around good quality product with quality ingredients. Best price around and would definitely recommend.
Review by: Stephen on Fri, Jun 9, 2023 12:00 PM
Got vanilla flavour to add fruit to make it taste better but its actually really tasty as plain vanilla, really thick and makes my blender work overtime but highly recommend
Review by: Bryce on Mon, Jun 5, 2023 2:05 PM
Standard taste but the price makes it taste better
Review by: Liam on Mon, May 1, 2023 3:05 PM
Great taste, mixes well. Had to adjust the amount of liquid tho as was very thick.
Early days yet but it appears to be helping increase weight and appetite of severely under weight teenage boy.
Review by: Beryl on Sat, Mar 18, 2023 8:15 PM
Great taste, Mixes well!! and helps to stack on the muscle! 5 stars!!
Review by: Brett on Mon, Mar 13, 2023 2:32 PM
Review by: Anonymous on Fri, Jan 20, 2023 11:06 PM
Just a suggestion to the product developers.
Its too sweet, perhaps come up with a formula that has perhaps 50% less sugar.

The flavor is fine.

Review by: Jay on Mon, Dec 26, 2022 10:32 AM
The chocolate is a great taste and mixes up easily. To early to see any results though.
Review by: Kahu on Tue, Dec 13, 2022 1:15 PM
Great taste and mixes well, hard to beat!
Review by: Cam on Wed, Aug 17, 2022 12:13 PM
Love the taste and feeling so full of energy afterwards. Have only just started using this product, but hoping it works as good as it tastes.
Review by: karl on Mon, Jul 4, 2022 3:21 PM
Easy to dissolve and it tastes yummy. Best for a early morning pick-me-up.
Review by: AL on Sun, Jun 12, 2022 9:35 PM
very nice to create smoothies, with banana, as an example. No unpleasant aftertaste. However, I can't rate the mass gained as I've only been using the product for a couple of weeks or so.
Review by: Bradley on Wed, Jun 1, 2022 10:43 PM
Doesn't ruin your stomach after drinking. Vanilla is better than chocolate.

Best part of NZ protein is the delivery times.

-1 since the choc flavour tastes like cheap choc.
Review by: Anonymous on Tue, May 3, 2022 4:06 PM
Amazing Delicious Vanilla shake , i would Recommend this product
Defiantly need more flavors for the Mass Gainer
Review by: Te on Wed, Apr 27, 2022 12:48 PM
Great product and fantastic delivery comes in 1-3 days
Cheers NZ protein
Review by: Stacey on Thu, Mar 10, 2022 1:04 PM
My husband loves it
Review by: Stacey on Mon, Oct 11, 2021 11:50 AM
Great product! Has certainly helped me bulk up and it doesn't make me feel sick. Would recommend!
Review by: Vincent on Wed, Oct 6, 2021 9:33 AM
Great product! Very thick and awesome taste. Great delivery time as well.
Review by: Ryann on Wed, Aug 25, 2021 5:33 PM
Great product
Very pleased with the fast delivery👌
Review by: Stacey on Thu, Jun 24, 2021 8:15 AM
Awesome product, great service
Review by: Lal on Sun, May 30, 2021 8:45 AM
Great Protein & fast delivery 👍🏻
Review by: Stacey on Wed, Apr 21, 2021 9:00 AM
great taste, super thick, good value for money and the service is AMAZING! love the chocolate!
Review by: Bernadette on Thu, Mar 25, 2021 9:10 AM
Stuffs great, tastes like pudding. Reminds me of the classic MetRx from late 90s
Review by: Al on Mon, Feb 1, 2021 8:34 PM
Everyone in my household loves this stuff so it’s damn hard to keep it in the cupboard.
Review by: Paula on Mon, Sep 14, 2020 5:23 PM
Little bit too sweet for my 18 year old son - gets a bit sickly.
More flavour choice would be good
Review by: Anonymous on Mon, Aug 17, 2020 8:22 PM
Great taste! Excellent delivery and service
Review by: Lisa on Thu, Jun 25, 2020 8:50 AM
Review by: Santokh on Wed, Jun 3, 2020 12:43 AM
Prompt and informed delivery process. 10 out of 10
Review by: Martyn on Fri, May 22, 2020 7:00 AM
Product and service were spot on
Review by: Martyn on Thu, Apr 30, 2020 6:56 AM
Hello, yes I am very happy with product so happy I will certainly get another one thank you.
Review by: Anonymous on Thu, Apr 23, 2020 12:30 AM
There's more protein and calories in the regular protein powder. The ingredients are slightly different, but would be better to just take more of the protein powder??

It does taste great though! Reliable and delicious flavours always, but a bit disappointed with the product in all. NZPROTEIN REPLY: this has more calories per serve. It's a different product for a different purpose.
Review by: Anonymous on Mon, Mar 2, 2020 8:39 PM
Fantastic Taste and texture and a great service overall.
Review by: Maxim on Thu, Jan 23, 2020 9:43 AM
Clean, easy, and tastes great. Good price and service!
Review by: Justin on Thu, Jan 16, 2020 11:37 AM


Click on a flavour to see the nutritional information.

Gourmet Vanilla

Serving size: 100g
Servings per pack: 10

Name Ave Quantity Per Serving Ave Quantity Per 100g
Energy 1906kJ 1906kJ
Calories 437 437
Protein 33g 33g
       - Gluten 0g 0g
Fat - total 17.9g 17.9g
       - Saturated 11g 11g
Carbohydrate 40.3g 40.3g
       - Sugars 23g 23g
Sodium 380mg 380mg

Ingredients: Whole Milk Powder (Contains Soy Lecithin), Whey Protein Concentrate, Starch (Modified Tapioca), Flavour, Salt, Sweetener (Sucralose)
Allergen warning: Contains milk, soy (lecithin)

Double Chocolate

Serving size: 100g
Servings per pack: 10

Name Ave Quantity Per Serving Ave Quantity Per 100g
Energy 1835kJ 1835kJ
Calories 423 423
Protein 32.8g 32.8g
       - Gluten 0g 0g
Fat - total 16.5g 16.5g
       - Saturated 10.1g 10.1g
Carbohydrate 38.1g 38.1g
       - Sugars 20.4g 20.4g
Sodium 360mg 360mg

Ingredients: Whole Milk Powder (Contains Soy Lecithin), Whey Protein Concentrate, Starch (Modified Tapioca), Cocoa (Contains Sunflower Lecithin), Flavour, Salt, Sweetener (Sucralose)
Allergen warning: Contains milk, soy (lecithin)