We Compared 3 Popular Whey Protein Isolates in Australia
Protein powders can look remarkably similar from the front of the packet. But serving size, protein concentration, ingredients, sweetness and price can tell a very different story. We put three popular Australian options side by side to see what you're actually getting.
The comparison at a glance
Three products, three different priorities. Here's where each one stands.
WPI 90
High protein concentration in every scoop. Uses thaumatin, a naturally-derived sweetener, instead of high-intensity artificial alternatives. Fewer ingredients, less sweetness. Positioned as a premium formulation for people who read labels carefully.
Best for: High protein concentration + lower sweetness
Explore The Whey Co WPI 90 →
Whey Protein Isolate
An established Australian brand with a wide flavour selection and strong brand recognition. Solid WPI formulation with a broad product ecosystem. Good choice for people who want variety across flavours or product types.
Best for: Established brand with wide flavour range
Shop True Protein →
Whey Protein Isolate
One of Australia's largest supplement suppliers with consistently competitive pricing. A no-frills WPI that does what it says. The most cost-effective option in this comparison when measured by price per kilogram.
Best for: Value-focused buyers
Shop Bulk Nutrients →27g of protein isn't always 27g of protein
Both products below can legally claim "27g protein per serve." But look closer at what that actually means.
Both products can advertise 27g of protein per serve. But one requires more powder to deliver it. That's why protein percentage can be more useful than simply comparing the number printed on the front of the packet.
What we compared
Five criteria where the products genuinely differ.
Protein concentration
How much of the actual powder is protein — not just grams per scoop.
Ingredients
What else is in the scoop alongside the whey protein isolate.
Sweetness
The sweetener type and how the brand approaches flavour intensity.
Value
Price relative to pack weight and actual protein delivered per dollar.
Overall formulation
How the complete product is put together — not just the headline number.
Side by side
Based on vanilla flavour where available. Protein figures are approximate and vary by flavour.
| The Whey Co WPI 90 | True Protein WPI | Bulk Nutrients WPI | |
|---|---|---|---|
| Pack size | 1kg | 1kg | 1kg |
| Price (approx.) | ~$89–$99 | ~$79–$89 | ~$69–$79 Lowest |
| Serving size | 30g Smallest | ~31g | ~33g |
| Protein per serve | ~27g | ~25g | ~26g |
| Protein % | ~90% Highest | ~81% | ~79% |
| Calories | ~115 kcal | ~118 kcal | ~121 kcal |
| Carbohydrates | ~1–2g Lowest | ~2–3g | ~2–3g |
| Fat | ~1g | ~1g | ~1g |
| Sweetener | Thaumatin | Stevia | Stevia |
| Main ingredients | WPI, flavour, thaumatin | WPI, flavours, stevia | WPI, flavours, stevia, guar gum |
| Price per 100g | ~$9.40 | ~$8.40 | ~$7.40 Lowest |
| Cost per 25g protein | ~$8.70 | ~$8.40 | ~$7.10 Lowest |
| Explore The Whey Co → | Shop True Protein → | Shop Bulk Nutrients → |
Prices are approximate based on publicly advertised Australian retail pricing at the time of publication. Nutritional values may vary between flavours. Unflavoured versions typically show higher protein percentages than flavoured equivalents.
Protein concentration
How much of each scoop is actually protein — vanilla flavour, approximate figures.
Flavoured proteins contain less protein by weight than unflavoured versions because flavouring ingredients contribute to the total scoop weight. These figures use vanilla flavour across all three products for a fair comparison.
What's actually in the scoop?
Each product broken into ingredient categories. Manufacturers don't disclose ingredient percentages, so these show categories rather than proportions.
The Whey Co WPI 90
Vanilla flavour
True Protein WPI
Vanilla flavour
Bulk Nutrients WPI
Vanilla flavour
The Whey Co WPI 90
The WPI 90 name reflects the product's core selling point: roughly 90% of the powder is protein. That figure is notably higher than most flavoured WPIs, which typically fall between 79% and 85% depending on the flavour system used.
The sweetener choice is a meaningful differentiator. Thaumatin is derived from the West African katemfe fruit and is orders of magnitude sweeter than sugar by weight, meaning very little is needed. The result is a less-sweet profile than stevia-based products, which some people find bitter. Whether that suits you depends entirely on your palate.
- Protein concentration is among the highest we've seen in a flavoured Australian WPI
- Thaumatin produces a cleaner, less-sweet finish than high-intensity artificial sweeteners
- Short ingredient list with no gums or unnecessary thickeners
- Premium pricing — the most expensive option in this comparison
- Fewer flavour options than True Protein or Bulk Nutrients
- Lower sweetness won't appeal to everyone — those who prefer a sweeter shake may not enjoy it
True Protein Whey Protein Isolate
True Protein is one of Australia's most recognisable supplement brands. It has been operating for over a decade and has built a loyal customer base through consistent quality, broad product range and strong online presence. The WPI formulation is solid and the brand regularly updates its product line.
Where True Protein stands out is choice. The flavour range is considerably wider than The Whey Co's offering, which matters to customers who want variety across the week or who are new to protein powder and want to experiment before committing to a preferred flavour.
- Established Australian brand with a strong track record
- Wide flavour range — far more options than the other two products here
- Sunflower lecithin aids mixability without adding noticeable flavour
- Protein percentage is lower than The Whey Co at equivalent flavour — serving size is larger for a similar protein yield
- Mid-range pricing sits between the premium and budget options
- Stevia can have a detectable bitter aftertaste for some people
Bulk Nutrients Whey Protein Isolate
Bulk Nutrients is the value proposition in this comparison, and that's a genuine strength. The Tasmanian-based company manufactures and ships direct, keeping overheads low and passing savings to customers. For anyone whose primary concern is price per kilogram, Bulk Nutrients is the obvious starting point.
The protein concentration is the lowest of the three at approximately 79% for vanilla flavour, which means more of each scoop consists of non-protein ingredients. That's not unusual at this price point — flavouring systems and thickeners like guar gum add to the scoop weight. The product still delivers meaningful protein per serve, just with a proportionally larger scoop.
- Lowest price per kilogram of the three — and lowest cost per 25g protein
- Direct-to-consumer model with a broad, frequently updated product range
- Widely available and well-reviewed across Australian protein communities
- Lowest protein concentration of the three — larger scoops for a similar protein yield
- Guar gum adds texture that some prefer and others find less clean
- Stevia-forward sweetness profile
What are you actually paying for?
Price per kilogram is only part of the story. Scoop size and protein concentration change the real cost.
Bulk Nutrients wins on headline price. But the scoop size and protein concentration tell a different part of the story below.
Per-serve cost follows a similar pattern. Bulk Nutrients remains cheapest, but serve sizes differ across all three.
Comparing cost per 25g of actual protein is the most honest measure. Bulk Nutrients leads; True Protein and The Whey Co close the gap when you account for their higher protein concentration per gram of powder.
Which one is right for you?
Three different priorities. Three different answers.
Choose The Whey Co if...
You care most about protein concentration, prefer a less-sweet formula and want a short, clean ingredient list. You're happy to pay more knowing a larger proportion of each scoop is the protein you're actually after.
Choose True Protein if...
You want an established Australian brand with plenty of flavour options. You value the ability to try different flavours without compromising on overall product quality, and mid-range pricing suits your budget.
Choose Bulk Nutrients if...
Price is your primary consideration. You want a solid Australian WPI at the lowest cost per kilogram, and you're comfortable with a slightly larger scoop to hit your protein target.
The verdict
There isn't one protein powder that's best for everyone. Price, sweetness, flavour variety and protein concentration all matter differently depending on what you're looking for.
If price is the main priority, The Whey Co probably isn't the obvious choice. Bulk Nutrients delivers a lower cost per kilogram and a lower cost per 25g of protein. But if what matters is getting the highest proportion of whey protein isolate in each scoop, a less-sweet formula and a shorter ingredient list, The Whey Co's numbers make a clear case for itself. The premium is real. So is the difference in formulation.
More protein. Less of everything else.
The Whey Co WPI 90 is built around one idea: a higher proportion of each scoop should be the protein you're paying for.
Explore The Whey Co WPI 90 →How we compared them
This comparison is based entirely on publicly available product information. Sources used include:
- Manufacturer nutrition information panels
- Ingredient lists published on brand websites
- Serving size information from current product packaging
- Publicly advertised Australian retail prices at the time of publication
These three products were not purchased and physically taste-tested side by side. Sweetness and flavour assessments are based on formulation information (sweetener type, ingredient list) rather than a conducted tasting. We have not invented taster quotes, taster names, laboratory results, certifications or any nutritional figures beyond what manufacturers publish.