Grass Fed Whey Protein Natural (Unflavoured) 5kg (166 servings)


Product Description

For serious protein consumers only- 5kg of 100% pure, unflavoured and unsweetened Grass Fed Whey protein! This 2-3-month supply of natural Grass Fed Whey Protein is silky smooth, creamy and light on the palate. It mixes perfectly with water, milk or coconut water. Shake it or add it to your favourite healthy smoothie and take your nutrition to the next level. 166 servings in reusable 5kg tubs, with Free Australian Shipping.

Why Is Mirrabooka Grass Fed Whey Protein The Best Protein?

It's what we put in and what we leave out that makes Mirrabooka Protein the best.

Mirrabooka Protein is pure, premium quality, single origin, 100% Australian grass fed whey protein. This is not a blend of lower quality proteins. Mirrabooka is pure and clean- it does not contain any filler ingredients or artificial additives. Just the cleanest, purest grass fed Australian Whey Protein.

  • All natural, no artificial additives 
  • Single origin grass fed Australian whey protein- not a blend of lower quality proteins
  • No filler ingredients- means more protein per serving, not cheap filler ingredients
  • Naturally flavoured -  sweetened 

Why Is Mirrabooka The Best Tasting Protein Powder?

Our natural whey protein is deliciously smooth and creamy, and it mixes well in water.

  • Dissolves and mixes well -  shake it up with water
  • Smooth texture - not grainy or gritty, no powdery residue
  • Naturally creamy and slightly sweet - not bland and tasteless
  • Lightly flavoured and sweetened- not unpalatable

The Best Protein For Women

Getting enough dietary protein is essential for women's health. You need the most bio-available, fast digesting, low carb, clean ingredient, natural protein powder that tastes great so you can drink it at any time of day.

  • Promotes satiety- keeps you feeling fuller for longer between meals
  • Assists with weight loss- consuming higher levels of protein can assist you reducing total calories
  • Maintains lean muscle- fuels and maintains your lean muscle mass
  • Gluten free and low carb 

Why Is Mirrabooka Whey Protein The Best Protein For Men?

You need a fast digesting, great tasting, pure, clean and natural, complete protein to ensure you meet your daily protein intake requirements, to develop lean muscle, recover from sport and exercise, and maintain your immune system. You don't want filler ingredients and slow-release, low quality protein sources.

  • Complete protein - naturally contains all 9 essential amino acids needed for optimal health.
  • Naturally high in BCAAs - contains 4.5g of Branched Chain Amino Acids leucine, isoleucine, and valine which switch on your body's muscle building process
  • Fast digesting and bio-available protein - you absorb the protein quickly when you need it (pre and post exercise) and get maximum nutrition from each serving

Single Origin Whey Protein

Whey protein blends contain a mixture of lower quality protein sources to reduce production costs. Protein origin matters because climate, farming practices, processing and other factors affect the quality, taste and bio-availability of the final product.

Mirrabooka Protein is made from a single source of premium Australian whey protein concentrate. What makes Australian dairy so good? It comes from Australia's South East region- predominantly Victoria, South Australia and Tasmania.
This region has the ideal climate for year round pasture grazing, adequate sunshine and rainfall, good soil and pasture growth and excellent animal health. This results in less need for fertilisers and feed crops, and year round supply of grass fed cows milk, so you get the purest and best quality protein in every serving.

Ultrafiltered Whey Protein Concentrate

Ultrafiltered whey protein concentrate has undergone the least and most gentle processing of any whey protein, preserving a broader range of nutritional benefits (assisting lean muscle growth, weight loss and supporting your immune system), bio-availability and maintaining better taste than whey protein isolate.

Our ultrafiltered whey protein concentrate is Australian made from farm to packaging (cocoa, vanilla and stevia are not grown in Australia and must be imported).

Undenatured Whey Protein

Carefully sourced, processed and handled to prevent the protein and fragile protein fractions breaking down during processing and handling (denaturing). This preserves the protein structure and bio-availability, so that the beneficial macro and micro nutrients are broken down and absorbed in your digestive system.

Cold Processed Whey Protein

Whey protein is susceptible to damage from heat during the the entire process from farm to packaging. Mirrabooka Protein is low temperature processed and not exposed to prolonged high temperatures that damage the micro and macro nutrients, during the the entire process from farm to packaging. This preserves the nutritional quality and bio-availability.

No Artificial Additives

Many off the shelf protein powders contain a long list of artificial ingredients including synthesised vitamins, artificial flavours and artificial sweeteners (Sucralose). Artificial additives are highly potent and cheap to use- however they are not recognised by the human body as food, and may lead to long term weight gain, health problems and disease.

Mirrabooka Protein only contains the minimum number of necessary ingredients from natural sources. 

No Filler Ingredients

Mirrabooka Protein does not contain any filler ingredients such as maltodextrin, milk powder, skim milk powder, coconut flour, psyllium, sugar or fibre (inulin etc). 

These ingredients are used in many mass produced protein powders to bulk the product, reduce production costs and sweeten the product - at the expense of your health and nutrition. Those products are carefully formulated to maintain the protein source as the primary (first) ingredient- whilst the protein content per 100g is very low.

Note: 5kg tubs have a strong seal

The 5kg tubs have a strong seal and can be difficult to open the first time.
To open:
  1. Remove the tamper evident seal
  2. Pull up the lid in one place, then work around the circle until it peels open.
You may not need to close it fully after opening. Just close until air tight.
If opening the tub is a concern, we recommend purchasing our 2.5kg size jar with screw cap.
Shipping & Returns


Please see below chart for shipping costs as well as estimated delivery times.
Please note that Australia Post is currently experiencing delays to all areas.

Delivery Method Delivery Time Price
Standard Shipping (Parcel Post) 2-14 business days Free
Express Post 1kg total 1-7 business days $5.00
Express Post 2-2.5kg total 1-7 business days $10.00
Express Post 3-5kg total 1-7 business days $15.00
Express Post 6-10kg total 1-7 business days $25.00
Express Post 11-19kg total 1-7 business days $40.00
Express Post 20-25kg total 1-7 business days $50.00

Need more help? Email hello @


Mirrabooka Protein may accept returns of product purchased directly from through the Site only when all of the following conditions are satisfied:

  • The return request must be made to Mirrabooka Protein within 7 days of delivery; no returns will be accepted after this time period.
  • You must return the product in the same resalable and unopened condition as it was purchased.
  • Protein powder and other consumable product returns are only accepted if it was purchased through and the product is returned in resalable and unopened condition.
  • Returns for product where the tamper-evident seal has been broken will not be accepted.

If you need to make a return, please email us during normal business hours (9am-5pm Mon-Fri) before sending the product back. Please provide your Order number as received when an order was placed on the Site. Once we determine that your merchandise is eligible for return (see Return Policy), you will be given instructions on how to complete the process.

Any reimbursements will be made to the payment method used for the original purchase. Please allow up to 14 days for completion of this process.


Despite every effort to safely ship and deliver your order, we understand that on rare occasions products can be damaged in transit. If your order was damaged in delivery, please contact us immediately by email at and we will assist you. Please send photos of the damaged product as received and do not break the tamper-evident seal.

We are not responsible for lost or stolen product once it has been delivered to your delivery address.


As a consumer, you are entitled to the benefit of statutory consumer guarantees in respect of items or services purchased from Mirrabooka Protein. If you believe an item is faulty, not of acceptable quality, does not match the description provided or is not fit for purpose, you may be entitled to a remedy under the Australian or New Zealand Consumer Law. However these consumer guarantees do not apply where the item was damaged due to abnormal use or misuse.

Mirrabooka Protein reserves the right to update this Shipping Policy and Returns Policy at any time.


Customer Reviews

Based on 488 reviews
James B. (Canberra, AU)
Grass Fed Whey Protein Vanilla

Having an Australian company for ensuring there are no additives is very important to me. Knowing that I am drinking only what's on the container is very reassuring and the taste is fantastic. Thank you Mirrabooka.

Moe A.

Best protein shake I've had and amazingly it's good for you!

Susan E. (Perth, AU)
Grass Fed Whey Protein Protein Vanilla

Excellent product . Tastes fantastic. Great customer service. Quick delivery. Will be back.

Dan S. (Sydney, AU)
clean , great taste

enjoying this protein with its minimal ingredients, and no artificial anything. Taste is great, mixes easily and digests well.

TARAZ S. (Brisbane, AU)
Great product

I love the venila flavour. It does not have any nasty after-taste.

San (Adelaide, AU)
Best protein powder ever!

I have tried numerous protein powders and found Mirrabooka to be the best one. I bought the unflavoured variety and have used it in various combinations. Goes well with cold coffee, chocolate milk, even buttermilk. I use it for my teen boys' smoothies as well and they love it too.
Excellent product overall!

Daniel P. (Melbourne, AU)
Powders Ahoy

I’ve enjoyed Mirrabooka for over a year now It’s helped me sustain the 3-4 day weekly gym sessions . The goal is fitness and longevity’. I’m cautious of added chemicals the others throw in. The affects at the molecular level aren’t really known. What is known about additives is they boost profits for the seller. Mirrabooka is a good choice for its simplicity and avoidance of any gimmicks.

JBee (Hobart, AU)
Breakfast smoothy

Great product tasty and Australian made fast delivery I use it to make breakfast smoothies and protein treats

Stefan D. (Sydney, AU)
Best tasting protein out there!

Great taste with grass fed protein. Can’t ask for much more. Have been looking for a great tasting grass fed product for a while and finally landed on a great one. Thanks Mirrabooka!

eddie (Sydney, AU)
Best around

Great product. Not overly sweet like most other proteins. Flavours are spot on too. Doesnt leave you bloated and uncomfortable.

Directions For Use

Add one level scoop (30g) and 200-250ml of water to a shaker bottle.
Close the shaker bottle lid firmly to ensure a proper seal.
Shake well for 30 seconds, then drink immediately.

Consult our Protein calculator to learn how much protein you should be consuming per day, based on your unique needs.
Consume 1-3 times daily, 30-60 minutes after exercise or between meals as a snack.
For best results, consume enough protein to meet your daily protein requirements through a combination of protein-centric meals and protein supplementation spread throughout the day as part of a balanced diet and exercise program.

Compatability information:

  • Suitable for protein shakes and smoothies.
  • Shakes and blends well with cool or cold water, milk, skim milk, oat milk and almond milk.
  • Requires the use of a shaker bottle or a blender.
  • Protein powders do not mix with a teaspoon in a glass.
  • Not intended for use with hot liquids, e.g. hot water.

Australian whey protein concentrate.

100% of protein from Whey Protein Concentrate.
Natural flavour is unflavoured and unsweetened.

Our dedicated production facility does not process any products which contain fish, shellfish, wheat, egg, nuts, or gluten.
Whey protein is a dairy product, a milk product. It naturally contains lactose (approx. 2g per serving).
Contains traces of lecithin (soy or sunflower) for mixability.

Formulated without:
Filler ingredients, added sugar, proprietary blends, amino spiking, stimulants, synthetic vitamins, added sodium, artificial flavours, colours, thickeners, artificial sweeteners, anti-caking agents.

Our packaging is BPA free.