Whey Protein Isolate (WPI) Protein Powder
Bulk Nutrients' Whey Protein Isolate (WPI) comes from grass-fed, hormone (rbST) free cows. It is a low-temperature cross and ultra-filtered whey protein that remains completely undenatured.
Product Description
Buy Whey Protein Isolate Online
We believe it is one of the purest Whey Protein Isolates on the market, with high levels of protein and lower levels of fats, carbohydrates and sodium.
Our Whey Protein Isolate is naturally rich in amino acids, particularly branched chain amino acids (BCAAs) and essential amino acids (EAAs), which support optimum muscle growth in conjunction with a healthy diet (, ).
Why should you use Whey Protein Isolate (WPI)?
Bulk Nutrients' WPI is an exceptionally pure protein source, with much of the fat and lactose typically found in Whey Protein Concentrate filtered out.
- WPI is fast absorbing and can help build lean muscle ()
- Taken after a workout, WPI assists in recovery ()
- WPI can help to increase protein synthesis
- Whey Protein Isolate can help to boost the immune system ()
- Bulk Nutrients WPI is low in fats and carbs and has a negligible lactose content
A great selection of WPI flavours on offer...
Bulk Nutrients uses only the strongest sweetener available in our flavoured Whey Protein Isolate, which ensures an exceptionally pure finished product.
With flavours on offer like Chocolate WPI, Vanilla WPI, Banana WPI, Choc Honeycomb WPI and Salted Caramel WPI, to name a few.
And, because we use the strongest flavours available, we only need to include them as a fraction of the overall product which ensures an exceptionally pure WPI from Bulk Nutrients.
WPI vs WPC, which is better?
WPI and WPC come from the same source. Here are the benefits they both offer.
- WPI and WPC are both rapidly absorbing proteins
- Both WPI and WPC are great to consume after training ()
- They both contain minimal fats and carbohydrates per serve
- Both offer a great range of delicious flavours
The main difference... WPI is a more refined version of WPC and, because of this, offers significantly less lactose per serve.
So, if you are very sensitive to lactose and can’t live without whey or after a higher protein hit, give WPI a go!
WPI stacks well with other supplements in shakes...
Bulk Nutrients’ WPI is great in a protein shake with other muscle-building and performance-based supplements. We believe it is best used with...
- Carbohydrate powders such as Carb+
- L Glutamine to help retain muscle whilst dieting
- Creatine Monohydrate, one of the best value and researched supplements available ()
If you're after the fastest absorbing and most bioavailable protein source, choose Bulk Nutrients WPI.
Fast shipping on Whey Protein Isolate
At Bulk Nutrients, we offer $9 flat rate shipping and express postage for all orders 3.5kgs and under.
It's a very regular occurrence for Bulk Nutrients customers in capital cities to order one afternoon and have their order on their doorstep the following morning!
Bulk Nutrients’ WPI is an all round protein
Whey Protein Isolate (WPI) is an all-around protein source, so it is suitable for everyone from endurance athletes to strength athletes.
WPI is great for aiding recovery, strength and muscle levels as well as boosting the immune system.
If you're looking for a quick and easy high-protein breakfast, look at High Protein Overnight Oats. Or you might like to check out our other Salted Caramel / Choc Honeycomb flavoured proteins.
About Whey Protein Isolate
Whey Protein Isolate (WPI) is considered the industry standard for dairy protein quality and is made during the cheese making process. As it’s the most highly refined version of whey protein, Whey Protein Isolate has the highest level of protein and the lowest level of fats and carbohydrates.
Containing only traces of lactose, it is easily digestible and can be enjoyed by those with sensitive stomachs. Whey Protein Isolate has high levels of branched chain amino acids and essential amino acids, with a thorough spread of conditional and non-conditional amino acids.
Directions / Ingredients
WPI Serving Size
30 grams (approximately 1 flat scoop) after training for maximum nutritional benefit, or anytime during the day for a low fat snack replacement or to boost your protein intake. For the greatest accuracy, we recommend following our guide here.
Directions for Whey Protein Isolate
Combine powder with 300-400ml of water or low fat milk and consume immediately.
WPI Ingredients
Ingredients: Whey Protein Isolate (Milk) (Emulsifier (Sunflower Lecithin)), Flavouring, Sweetener (Sucralose).
Contains: Milk
Note:
- Chocolate based flavours contain cocoa.
- Salted Caramel contains salt.
- Raw does not contain any flavours or sweeteners.
- Choc Peanut is nut allergen free (no actual nuts in the flavouring, synthetic flavours) still has dairy allergens.
Storage
Keep well sealed, protect from moisture, light and heat.
Further Reading
What is Whey Protein?
Whey Protein Isolate vs Concentrate: A Detailed Comparison
How WPI Can Maximise Your Bulking Phase
How to Have a High-Calorie Weekend Meal and Still Lose Weight
The Role of Nutrition in Immune Function
How Protein Powder Actually Helps You Lose Weight and Keep It Off
Perfecting Your Protein Shake
Can Protein Powder Be Used for Weight Loss?
Product FAQs
How does Whey Protein Isolate taste?
WPI is flavoured and is generally considered to have a pleasant taste.
What is WPI made from?
Whey Protein Isolate is a protein derived from milk.
How is Bulk Nutrients' WPI packaged?
Bulk Nutrients' Whey Protein Isolate is packaged in resealable 1kg pouches.
Can I purchase WPI in smaller sizes?
Yes - WPI is also available in single-serve sachets which we call WPI Sample Packs.
Is the packaging for this product recyclable?
In theory yes, but not in all council areas right now.
The REDcycle program has been discontinued, and the industry is working together to find a solution to continue recycling soft plastics. For now, we recommend checking with your local council, but most require you to put the packaging in your regular landfill bin.
The included scoop can be recycled as hard plastic in your local council pickup.
For more information about what Bulk is doing to improve sustainability, check this article.
Can I receive a discount buying more than one of this product at once?
Absolutely! Price breaks for Whey Protein Isolate begin when you purchase 2 units of any flavour. Just add more than that to your cart to see the savings.
Does Bulk do a Natural version of WPI?
We sure do!
Our Natural Whey Protein Isolate is one of the cleanest and most pure whey proteins available on the market. Bulk Nutrients’ Natural WPI comes from grass fed cows and is 100% hormone free so you can be confident in the protein you’re using.
Natural WPI also contains virtually no lactose, and is extremely low in both fat and carbs, while maintaining 91% protein per serve.
We use natural flavours and stevia to sweeten to ensure our Natural WPI remains all natural.
Does Bulk do a WPI safe for use in tested sports?
Absolutely! We’re really proud that two flavours of our WPI are regularly HASTA tested, and are HASTA certified to support natural athletes and competitors with their training and recovery.
Currently we range our HASTA WPI in both Vanilla and Chocolate flavours and they’re used by a range of our ambassadors and sporting teams we work with.
Why is Whey Protein Isolate the best choice?
Whey Protein Isolate has the highest biological value of any protein source and WPI is the most processed and purest form of Whey Protein.
WPI contains around 1% fats, 1% carbohydrates and around 90% of protein. As it is rapidly absorbed, it is ideal post workout, especially when training in a fasted state.
Is Whey Protein Isolate lactose free?
Whey Protein Isolate contains small amounts of lactose which usually means it is suitable for lactose sensitive individuals. People with complete lactose malabsorption may still have trouble tolerating the lactose in whey protein isolate.
Comparatively though WPI contains very little lactose, at approximately 0.3 grams per serve it has forty times less lactose than a glass of milk.
Does Whey Protein Isolate contain gluten?
Gluten is not naturally occurring in any of the ingredients in our Whey Protein Isolate, though we do process other gluten containing ingredients in our facility.
How many serves of WPI should I have each day?
The answer here will depend on your weight, energy levels and goals.
Most athletes and active people aim to consume 2 grams of protein per kilogram of bodyweight per day. For an 80kg person, this equals 160 grams of protein. Two WPI shakes a day would contribute 52g of protein to this total, leaving approximately 108 grams of protein to be consumed through general food sources.
Protein from protein shakes should be one of multiple protein sources you consume, not the only one.
What is the standard dose of WPI powder?
30 grams is the generally accepted standard dose of WPI protein powder, as this yields between 25 and 28 grams of pure protein.
How long after a workout should I have WPI?
For optimal recovery and muscle growth, it’s generally recommended to take Whey Protein Isolate within 20-60 minutes after exercise.
Why is WPI better than eating tuna, meat or drinking milk?
Like other powdered protein sources, WPI is great value for money and can be very convenient.
With a long shelf life (usually up two years), WPI is extremely stable and can be stored, carried and consumed easily unlike a tin of tuna or steak.
WPI contains only trace amounts of fats and carbohydrates, as opposed to most high protein foods which contain these in higher amounts.
How soon should I drink WPI after mixing it with water?
While WPI is very stable in powdered form this changes when mixed with water. Once mixed with water, WPI should be consumed within an hour.
It can last more than 24 hours once blended with water if refrigerated.
Recipes
Lab Results
At Bulk Nutrients we take our products’ purity very seriously.
To maintain our Whey Protein Isolate’s consistent high quality, we send a cross-section of our product range to certified Australian laboratories for testing, such as National Measurement Institute (NMI), Southern Cross University, ARL and Scientest which are all independently verified and NATA/TGA accredited.
The NMI is a laboratory run by the Australian Government, which is used for police forensic testing, SIA - Sports Integrity Australia drug screening and by multinational food manufacturers for quality and safety testing.
NMI has conducted many hundreds of tests on Bulk Nutrients products for more than 10+ years.
Lab testing results for Whey Protein Isolate (WPI)
- 28/07/2026 - Whey Protein Isolate - Strawberry
- 25/06/2026 - Whey Protein Isolate - Salted Caramel
- 18/05/2026 - Whey Protein Isolate - Choc Peanut
- 24/04/2026 - Whey Protein Isolate - Vanilla Maple
- 16/03/2026 - Whey Protein Isolate - Vanilla
- 05/02/2026 - Whey Protein Isolate - Choc Honeycomb
- 14/01/2026 - Whey Protein Isolate - Chocolate
- 04/12/2025 - Whey Protein Isolate - Banana
- 24/10/2025 - Whey Protein Isolate - Strawberry
- 07/10/2025 - Whey Protein Isolate - Salted Caramel
- 21/09/2025 - Whey Protein Isolate - Raw (Unflavoured)
- 21/09/2025 - Whey Protein Isolate - Vanilla
- 08/08/2025 - Whey Protein Isolate - Cookies & Cream
- 09/07/2025 - Whey Protein Isolate - Iced Coffee
- 10/06/2025 - Whey Protein Isolate - Vanilla Maple
- 15/04/2025 - Whey Protein Isolate - Chocolate
- 25/03/2025 - Whey Protein Isolate - Choc Ice Cream
- 13/02/2025 - Whey Protein Isolate - Raw (Unflavoured)
- 07/02/2025 - Whey Protein Isolate - Vanilla
- 13/01/2025 - Whey Protein Isolate - Banana
- 13/01/2025 - Whey Protein Isolate - Chocolate
- 02/12/2024 - Whey Protein Isolate - Strawberry
- 02/12/2024 - Whey Protein Isolate - Vanilla Maple
- 04/10/2024 - Whey Protein Isolate - Raw (Unflavoured)
- 04/10/2024 - Whey Protein Isolate - Vanilla
- 24/09/2024 - Whey Protein Isolate - Salted Caramel
- 16/07/2024 - Whey Protein Isolate - Cookies & Cream
- 16/07/2024 - Whey Protein Isolate - Iced Coffee
- 16/07/2024 - Whey Protein Isolate - Vanilla
- 05/07/2024 - Whey Protein Isolate - Choc Peanut
Nutrition Panels
| CHOCOLATE FLAVOURS NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 480 | 1,600 |
| Protein (g) | 25.5 | 85.0 |
| Fats(g) | 0.5 | 1.6 |
| (saturated) (g) | 0.0 | 0.1 |
| Carbohydrates (g) | 1.7 | 5.7 |
| (sugars) (g) | 0.4 | 1.5 |
| Sodium (mg) | 65 | 217 |
| VANILLA NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 478 | 1,592 |
| Protein (g) | 26.2 | 87.3 |
| Fats(g) | 0.3 | 1.1 |
| (saturated) (g) | 0.0 | 0.1 |
| Carbohydrates (g) | 1.2 | 4.0 |
| (sugars) (g) | 0.5 | 1.6 |
| Sodium (mg) | 62 | 205 |
| BANANA NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 478 | 1,593 |
| Protein (g) | 26.1 | 87.1 |
| Fats(g) | 0.3 | 1.1 |
| (saturated) (g) | 0.0 | 0.1 |
| Carbohydrates (g) | 1.3 | 4.2 |
| (sugars) (g) | 0.5 | 1.5 |
| Sodium (mg) | 61 | 205 |
| CHOC PEANUT NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 480 | 1,599 |
| Protein (g) | 24.9 | 83.0 |
| Fats(g) | 0.5 | 1.6 |
| (saturated) (g) | 0.0 | 0.1 |
| Carbohydrates (g) | 2.3 | 7.6 |
| (sugars) (g) | 0.5 | 1.7 |
| Sodium (mg) | 64 | 213 |
| COOKIES & CREAM NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 478 | 1,594 |
| Protein (g) | 26.2 | 87.3 |
| Fats(g) | 0.3 | 1.1 |
| (saturated) (g) | 0.0 | 0.1 |
| Carbohydrates (g) | 1.2 | 4.1 |
| (sugars) (g) | 0.7 | 2.2 |
| Sodium (mg) | 62 | 179 |
| ICED COFFEE NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 477 | 1,591 |
| Protein (g) | 25.7 | 85.7 |
| Fats(g) | 0.3 | 1.1 |
| (saturated) (g) | 0.0 | 0.1 |
| Carbohydrates (g) | 1.7 | 5.6 |
| (sugars) (g) | 0.5 | 1.6 |
| Sodium (mg) | 61 | 202 |
| RAW (UNFLAVOURED) NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 474 | 1,579 |
| Protein (g) | 26.4 | 87.9 |
| Fats(g) | 0.3 | 1.1 |
| (saturated) (g) | 0.1 | 0.2 |
| Carbohydrates (g) | 1.0 | 3.4 |
| (sugars) (g) | 0.6 | 2.0 |
| Sodium (mg) | 69 | 230 |
| SALTED CARAMEL NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 475 | 1,584 |
| Protein (g) | 26.0 | 86.5 |
| Fats(g) | 0.3 | 1.1 |
| (saturated) (g) | 0.0 | 0.1 |
| Carbohydrates (g) | 1.3 | 4.4 |
| (sugars) (g) | 0.5 | 1.8 |
| Sodium (mg) | 131 | 437 |
| STRAWBERRY NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 478 | 1,592 |
| Protein (g) | 26.0 | 86.7 |
| Fats(g) | 0.3 | 1.1 |
| (saturated) (g) | 0.0 | 0.1 |
| Carbohydrates (g) | 1.4 | 4.7 |
| (sugars) (g) | 0.5 | 1.5 |
| Sodium (mg) | 61 | 204 |
| VANILLA MAPLE NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 477 | 1,590 |
| Protein (g) | 25.5 | 84.9 |
| Fats(g) | 0.3 | 1.1 |
| (saturated) (g) | 0.0 | 0.1 |
| Carbohydrates (g) | 1.9 | 6.3 |
| (sugars) (g) | 0.6 | 2.1 |
| Sodium (mg) | 60 | 200 |
| WHITE CHOC CARAMEL NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Serving size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Energy (kj) | 477 | 1,590 |
| Protein (g) | 25.7 | 85.7 |
| Fats(g) | 0.3 | 1.1 |
| (saturated) (g) | 0.0 | 0.1 |
| Carbohydrates (g) | 1.7 | 5.6 |
| (sugars) (g) | 0.5 | 1.6 |
| Sodium (mg) | 60 | 201 |
| TYPICAL WHEY PROTEIN ISOLATE AMINO ACID PROFILE | ||
|---|---|---|
| Servings per 1kg package: 33Servings size: 30g | ||
| Age Qty Per Serving | Age Qty Per 100g | |
| Alanine (mg) | 1,379 | 4,597 |
| Arginine (mg) | 726 | 2,420 |
| Aspartic Acid (mg) | 3,023 | 10,077 |
| Cysteine (mg) | 967 | 3,223 |
| Glutamic Acid (mg) | 4,257 | 14,190 |
| Glycine (mg) | 435 | 1,450 |
| Histidine (mg) | 484 | 1,613 |
| Isoleucine (mg) | 1,524 | 5,080 |
| Leucine (mg) | 3,459 | 11,530 |
| Lysine (mg) | 2,709 | 9,030 |
| Methionine (mg) | 580 | 1,933 |
| Phenylalanine (mg) | 919 | 3,063 |
| Proline (mg) | 1,088 | 3,627 |
| Serine (mg) | 1,088 | 3,627 |
| Threonine (mg) | 1,282 | 4,273 |
| Tryptophan (mg) | 580 | 1,933 |
| Tyrosine (mg) | 1,016 | 3,387 |
| Valine (mg) | 1,354 | 4,513 |
References
- Wolfe RR. Branched-chain amino acids and muscle protein synthesis in humans: myth or reality?. J Int Soc Sports Nutr. 2017;14:30. Published 2017 Aug 22. doi:10.1186/s12970-017-0184-9 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5568273/
- Pal, S., & Ellis, V. (2010). The acute effects of four protein meals on insulin, glucose, appetite and energy intake in lean men. The British journal of nutrition, 104(8), 1241–1248. PMID: 20456814 - https://www.cambridge.org/core/journals/british-journal-of-nutrition/article/acute-effects-of-four-protein-meals-on-insulin-glucose-appetite-and-energy-intake-in-lean-men/E8FE7C1BF5FBCB7F2C1C0A99B63C0B3D
- Naclerio F, Larumbe-Zabala E. Effects of Whey Protein Alone or as Part of a Multi-ingredient Formulation on Strength, Fat-Free Mass, or Lean Body Mass in Resistance-Trained Individuals: A Meta-analysis. Sports Med. 2016 Jan;46(1):125-137. doi: 10.1007/s40279-015-0403-y. PMID: 26403469 - https://pubmed.ncbi.nlm.nih.gov/26403469/
- Cintineo HP, Arent MA, Antonio J, Arent SM. Effects of Protein Supplementation on Performance and Recovery in Resistance and Endurance Training. Front Nutr. 2018;5:83. Published 2018 Sep 11. doi:10.3389/fnut.2018.00083. PMID: 30255023 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6142015/
- Ha DJ, Kim J, Kim S, Go GW, Whang KY. Dietary Whey Protein Supplementation Increases Immunoglobulin G Production by Affecting Helper T Cell Populations after Antigen Exposure. Foods. 2021 Jan 19;10(1):194. doi: 10.3390/foods10010194. PMID: 33477967; PMCID: PMC7835905 - https://pubmed.ncbi.nlm.nih.gov/33477967/
- Kreider RB, Campbell B. Protein for exercise and recovery. Phys Sportsmed. 2009 Jun;37(2):13-21. doi: 10.3810/psm.2009.06.1705. PMID: 20048505 - https://pubmed.ncbi.nlm.nih.gov/20048505/
- Cooper, R., Naclerio, F., Allgrove, J. and Jimenez, A., 2021. Creatine supplementation with specific view to exercise/sports performance: an update - https://jissn.biomedcentral.com/articles/10.1186/1550-2783-9-33
Reviews
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What Our Customers Are Saying
Customers overwhelmingly praised the protein powders for their enjoyable flavours, smooth texture, versatility and high protein content. Vanilla, chocolate, salted caramel and white chocolate caramel were popular in shakes, smoothies, oats, yoghurt and pancakes, while unflavoured appealed to those wanting a neutral option. Many reviewers reported easy mixing, convenient ordering and fast delivery. A small number found certain flavours less appealing, experienced clumping, or considered recent price increases disappointing.
Whey Protein Isolate
4.82 from 9265
Product Overview
Our Whey Protein Isolate (WPI) is ultra-high in protein, sourced from grass fed cows.
Taste
Mixability
Effectiveness
Value for Money
Lactose Free
Gluten Free Ingredients
Vegetarian
Vegan
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Availability & Shipping
Flat rate $9 shipping Australia-wide. Orders up to 3.5kg ship Express Post, over 3.5kg ship Parcel Post.
Multibuy Discounts
Save on Whey Protein Isolate with multibuy discounts. Add 2 or more bags of any flavour to your cart and start saving.
Price Per Bag
- 1kg = $79.00
- 2kg (2 x 1kg) bags = $74.50 each
- 3kg (3 x 1kg) bags = $74.00 each
- 4kg (4 x 1kg) bags = $73.00 each
- 5kg (5 x 1kg) bags = $72.00 each