We Compared 3 Popular
Whey Protein Isolates
in Australia
Protein powders can look almost identical from the front of the packet. The large number printed on the label, the clean photography, the reassuring claims. They all follow the same playbook.
But flip to the nutrition panel and the ingredient list, and the differences between products become much clearer. Protein concentration, scoop size, sweetener choice, ingredient count and price per gram of actual protein can vary considerably between brands that look similar at first glance.
So we put three popular Australian whey protein isolates side by side to see what you're actually getting in each scoop.
Left to right: Top Althlete Ultimate Whey Isolate, The Whey Co WPI 90, True Protein WPI 90. Prices and formulations reflect publicly available information at time of writing.
Three products. Three different priorities.
Each card shows the key numbers at a glance. The full breakdown is below.
The Whey Co
Whey Protein Isolate 90
Best for
Those who want the highest protein concentration with a minimal formulation.
True Protein
Whey Protein Isolate
Best for
Those who want variety, an established brand and flexibility in flavour selection.
Bulk Nutrients
Whey Protein Isolate
Best for
Buyers who prioritise price per kilogram and are comfortable buying direct from an Australian manufacturer.
Note: figures vary by flavour. This comparison uses vanilla or natural unflavoured equivalents wherever possible. Check the current nutrition panel on each product before purchasing.
What we looked at
This comparison draws on publicly available nutrition panels, ingredient lists, serving size disclosures and Australian retail prices. No products were purchased by this site for taste-testing purposes, so flavour assessments reflect formulation and brand positioning rather than a conducted side-by-side tasting.
Five areas are covered. Each one is something you can verify yourself by reading a label carefully — we've just done the calculation work.
1. Protein concentration
Grams of protein as a percentage of the total scoop weight. A more precise measure than grams per serve alone.
2. Ingredients
What else is in the powder beyond whey protein isolate. Flavouring agents, gums, sweeteners, emulsifiers.
3. Sweetness and flavour approach
Sweetener type and how each brand positions its flavour profile.
4. Value
Pack price, pack weight, price per 100g and — most usefully — approximate cost per 25g of actual protein delivered.
5. Overall formulation
Whether the scoop is predominantly protein, or whether flavouring and other ingredients take up a meaningful portion of each serve.
27g of protein isn't always the same thing
Two products can both claim "27g protein per serve" on the front of their packaging. But if one delivers that in a 30g scoop and the other delivers it in a 33g scoop, the proportion of actual protein is quite different.
Example — Powder A
30g scoop
27g
protein per serve
90%
protein concentration
90% of each scoop is protein
Example — Powder B
33g scoop
27g
protein per serve
81.8%
protein concentration
81.8% of each scoop is protein
Both products can advertise "27g protein per serve" — the number on the front of the packet is identical. But one delivers that protein in considerably less powder. That gap in concentration is where the real difference often sits, and it's why protein percentage is worth checking before you buy.
Side by side
Nutritional values vary between flavours. Where possible, vanilla flavour panels are used for consistency. Always check the current panel on the product you're purchasing.
| The Whey Co WPI 90 | True Protein WPI | Bulk Nutrients WPI | |
|---|---|---|---|
| Product type | Whey Protein Isolate | Whey Protein Isolate | Whey Protein Isolate |
| Serve size | ~30g | ~32g | ~30g |
| Protein per serve | ~27g | ~25–27g | ~26g |
| Protein % | ~90% | ~78–84% | ~85–87% |
| Calories per serve | ~115 kcal | ~120–130 kcal | ~115–120 kcal |
| Carbohydrates | ~1–2g | ~2–3g | ~1–2g |
| Fat | ~0.5g | ~1g | ~0.5g |
| Sweetener | Stevia | Stevia / varies by flavour | Sucralose or Stevia (flavour dependent) |
| Pack size (typical) | 1kg | 500g – 1kg+ | 1kg – 3kg+ |
| Price (approx. AUD) | ~$59–$69 / kg | ~$55–$65 / kg | ~$45–$55 / kg |
| Cost per 25g protein | ~$5.40–$6.40 | ~$5.50–$6.70 | ~$4.30–$5.30 |
| Sweetener type | Natural (Stevia) | Natural (Stevia) or artificial | Artificial or natural (flavour dependent) |
| Shop | Shop The Whey Co → | Shop True Protein → | Shop Bulk Nutrients → |
Prices are approximate and based on publicly listed Australian retail prices at time of writing. They may have changed. Nutritional figures are approximations based on published panels and may differ between flavours or batch reformulations. Verify all figures against the current product panel before purchasing.
The Whey Co WPI 90
NEW Australian brand · Whey protein isolate · CLEAN TASTE, NATURALLY sweetened
The WPI 90 name is a direct reference to its protein concentration: 90% protein by weight. That figure places it at the higher end of what whey protein isolates in the Australian market typically deliver, where 80–87% is more common across standard formulations.
The ingredient list is notably short by industry standards, which reflects a formulation philosophy of letting the protein percentage carry the product rather than layering in flavour complexity. Thaumatin is used as the sweetener, giving it a lighter natural sweetness profile compared to products using sucralose or other artificial sweeteners.
At around $109 per kilogram, it sits at a premium price point, which is consistent with the product's positioning. Whether that premium is justified depends on how much the concentration difference matters to the individual buyer.
What we like
- High protein concentration (~90%)
- Short, clean ingredient list
- Thaumatin - Natural sweetener, no bad aftertaste
Things to consider
- Not good if you're on a budget
- Fewer flavour options than other brands
- Lower sweeter taste is not for everyone
Best for
Anyone focused primarily on protein concentration, clean smooth mix and quality rather than flavour variety, who prefers a less sweet taste and doesn't mind paying slightly more per kilogram.
True Protein WPI
Australian brand · Whey protein isolate · Multiple sweetener options
True Protein is one of the more established Australian supplement brands, with a broad product range and a reputation built significantly on flavour variety and product accessibility. Their WPI is well-regarded and widely stocked, which is a meaningful practical advantage for buyers who prefer picking up product from a physical retailer.
Protein concentration sits in the 78–84% range depending on flavour, which is slightly behind The Whey Co WPI 90 but consistent with many well-formulated WPIs in this category. The serve size is typically around 32g, and flavouring ingredients account for part of that additional weight.
True Protein's range of flavours is one of its genuine strengths. For buyers who struggle with the taste of plain or lightly flavoured proteins, that variety is a real practical consideration.
What we like
- Wide flavour range
- Established, trusted brand
- Good retail availability
Things to consider
- Lower protein concentration than WPI 90
- Sweetener varies by flavour
- More complex ingredient lists on some flavours
Best for
Buyers who want a reputable Australian WPI with broad flavour options and don't want to order directly from a brand's own website.
Bulk Nutrients WPI
Australian manufacturer · Whey protein isolate · Price-focused
Bulk Nutrients is manufactured and sold directly in Australia, which allows them to price their products significantly below brands with retail distribution overhead. For buyers who are comfortable buying direct and are cost-conscious, this is a meaningful advantage. Their WPI is one of the better-value options in the Australian market on a straight price-per-kilogram comparison.
Protein concentration sits around 85–87%, which is competitive. The ingredient list is relatively short. Sweetener choice varies depending on the flavour selected, some use sucralose, others stevia, so it is worth checking the specific flavour panel if sweetener type matters to you.
The brand's direct-to-consumer model also means they offer larger pack sizes (up to 3kg and beyond), which brings the price per kilogram down further for committed buyers.
What we like
- Lowest price per kilogram
- Solid protein concentration (~85–87%)
- Large pack sizes available
Things to consider
- Sucralose in some flavours
- Direct-to-consumer only
- Packaging less premium-feeling
Best for
Cost-conscious buyers who don't mind ordering online direct, and want to buy in larger quantities.
What's actually in the scoop?
Ingredient categories shown below are based on publicly available information. Specific ingredients vary by flavour.
The Whey Co WPI 90
Short ingredient list. Protein isolate is listed first, indicating it is the primary ingredient by weight.
True Protein WPI
More flavour options means ingredient lists vary more. Simpler flavours tend to have shorter lists.
Bulk Nutrients WPI
Sweetener type varies meaningfully by flavour. Check the specific flavour panel if this matters to you.
Which one is right for you?
The right answer depends on what you're actually optimising for. Here's a simple breakdown.
Choose The Whey Co if...
Protein concentration per gram of powder and high quality is your priority, you prefer a less sweet taste, and you want a short, clean ingredient list. The higher price per kilogram reflects the higher protein percentage rather than branding overhead.
Choose True Protein if...
You want a broad flavour range from an established Australian brand, value retail availability, and find that having more flavour variety helps you stay consistent with your protein intake over time.
Choose Bulk Nutrients if...
Budget and lowest cost is the primary consideration, you're comfortable ordering directly online, and you're happy to check the sweetener used in your chosen flavour before buying.
The final word
There isn't one protein powder that's right for everyone. Price, formulation, sweetener preference and protein concentration all pull in different directions depending on what a particular buyer actually needs.
What this comparison makes clear is that reading the nutrition panel rather than the front-of-pack marketing is the single most useful thing you can do before buying. A 90% protein concentration versus an 82% one is a meaningful difference that won't appear anywhere in the headline claims.
If the priority is getting a high proportion of actual protein per gram of powder in a formulation with few ingredients, the numbers favour The Whey Co WPI 90. But if value or flavour variety matter more, the other two options both have genuine merit.
Related reading
Buying Guide
Whey Isolate vs Concentrate
What the processing difference actually means for your protein intake.
Buying Guide
Best Protein Powder Australia
Our full guide to choosing protein powder in the Australian market.
Guide
Vanilla Protein Powder
Why vanilla remains the benchmark flavour and what to check on the label.
How this comparison was prepared
All nutritional figures and ingredient information in this comparison are drawn from publicly available nutrition panels and ingredient lists published by each brand on their website or product packaging at the time of writing. Prices are based on publicly advertised Australian retail prices and are subject to change at any time.
No physical taste-testing was conducted by this site. No products were purchased or provided by any brand for review purposes. Flavour assessments reflect published formulation information and brand positioning only. No laboratory testing, independent analysis or sponsored arrangement informed any statement in this article.
Nutritional values can differ between flavours of the same product. Always verify the current nutrition panel for the specific product and flavour you intend to purchase. This article is for informational purposes only and does not constitute nutrition or dietary advice.