BulkWhey isolate
Bulk Pure Whey Isolate
Prices checked . Label checked .
Bulk Pure Whey Isolate costs £1.30 per 25g of protein in the 4kg pack (£167.99 at Bulk). That makes it the 18th cheapest of 21 reviewed animal-protein powders with a live price. It is a whey isolate with 81g of protein per 100g and 24g in a 30g scoop, on the manufacturer's label.
- Best for
- Lifters who find concentrate heavy after training and want 1.4g of sugar and 1g of fat per 100g.
- Skip if
- Concentrate sits fine with you, since a scoop gives only 1g more protein than Pure Whey Protein.
- Watch out
- The page headline says 26g of protein, but the published panel reads 24g in a 30g scoop.
- Protein / 100g
- 81g
- Per 30g scoop
- 24g
- Per 25g protein
- £1.30
- 4kg pack
- £167.99
Our verdict on Bulk Pure Whey Isolate
Bulk Pure Whey Isolate is worth buying over Bulk's concentrate if concentrate sits heavy on you or you are cutting. A 30g scoop gives 24g of protein against the concentrate's 23g, so you are paying for what is stripped out: sugar falls from 12g to 1.4g per 100g and fat from 3.5g to 1g. Bulk's headline says 26g, but the panel says 24g. Flavour quality varies between lines, so try a 500g bag first, and do not confuse it with the stevia-sweetened Natural Pure Whey Isolate.
How the price compares
Bulk Pure Whey Isolate against the 3 reviewed powders nearest to it on type and price, on cost per 25g of protein. Each figure is that product’s best in-stock partner listing, packs of 400g and over.
| Product | Type | Protein / 100g | Per 25g protein |
|---|---|---|---|
| Prozis 100% Whey Hydro Isolate ULTIMATE SERIES | Whey isolate | 83g | £1.16 |
| Applied Nutrition ISO XP | Whey isolate | 90g | £1.18 |
| MyProtein Impact Whey Isolate | Whey isolate | 82g | £1.29 |
| Bulk Pure Whey Isolate | Whey isolate | 81g | £1.30 |
Where to buy Bulk Pure Whey Isolate
Live prices from partner retailers, one row per retailer at its best value pack, ordered by cost per 25g of protein. A bigger pack usually costs less per 25g, so compare like for like.
| Retailer | Pack size | Price | Per 25g protein | Go to retailer |
|---|---|---|---|---|
| Bulk | 4kg | £167.99 | £1.30 | View deal ↗ |
| Amazon UK | 2.5kg | £111.99 | £1.38 | View deal ↗ |
Sold in 500g, 1kg, 2.5kg, 5kg. 2 partner retailers stock a 400g or larger pack.
Pros and cons
Pros
- Only 1.4g of sugar and 1g of fat per 100g, so it costs you almost nothing outside the protein
- Buyers repeatedly describe it as easier on the stomach than the concentrate
- Sunflower lecithin, no soy
- Same 500g to 5kg size ladder as the concentrate, so you can trial before committing
Cons
- The page headline says 26g and the label says 24g in a 30g scoop. Plan on 24g
- Flavour is inconsistent between lines, and the malted chocolate variants attract specific, repeated criticism
- Easy to confuse with Natural Pure Whey Isolate, which is a different product sweetened with stevia
- Buyers report receiving Pure Whey Protein when they ordered the isolate, so check the bag before you open it
Nutrition and ingredients
From the manufacturer’s published label (Source). A single isolate, filtered further than the concentrate, so lactose drops from around 12g per 100g to 1.4g. That is the whole reason to pay the difference: it is the version you can drink straight after a session without it sitting on you.
Bulk titles the page "26g Whey Protein Isolate" but the panel it publishes reads 24g in a 30g scoop, because the flavoured tub carries cocoa and flavouring that the marketing figure does not. 24g is the number to plan your day around.
| Nutrient | Per 100g | Per 30g |
|---|---|---|
| Protein | 81g | 24g |
| Energy | 360 kcal | 108 kcal |
| Carbohydrate | 5g | 1.5g |
| of which sugars | 1.4g | 0.4g |
| Fat | 1g | 0.3g |
| of which saturates | 0.5g | 0.1g |
| Fibre | 3.4g | 1.0g |
| Salt | 0.62g | 0.2g |
- Protein source
- Whey protein isolate (milk)
- Sweeteners
- Sucralose
- Emulsifier
- Sunflower lecithin
- Pack sizes
- 500g, 1kg, 2.5kg, 5kg
- Flavours
- Flavour quality is the least consistent thing about this product. Vanilla and strawberry get praised; the chocolate malted honeycomb line gets taken apart by name in more than one review below.
- Third-party testing
- Informed Sport: no evidence found. As with Pure Whey Protein, Bulk keeps batch testing in its separately sold Informed range. Nothing on this product page claims third-party testing.
- Made by
- Sports Supplements Limited, trading as Bulk, Colchester, Essex
What the maker does not publish
- Bulk publishes the chocolate panel only. The unflavoured tub is sold under the same name and will be higher in protein per 100g, but Bulk does not publish a separate figure for it.
- The gap between the "26g" in the page title and the 24g on the panel is not explained anywhere on the product page.
Method: nutrition figures come from the manufacturer label. Cost per 25g of protein is the pack price divided by the grams of protein in the pack, multiplied by 25.
What buyers say
Quoted word for word and linked, so you can read the full review or thread.
Recurring themes
- More than one buyer reports a packing mix-up, from the wrong flavour in the bag to concentrate arriving instead of isolate.
“The Whey Isolate offers a big, clean protein bang for your buck.”
“Bulk protein is pretty good specially the isolate as it is lighter on tummy.”
“Chocolate malted honeycomb whey isolate tastes genuinely awful.”
“On last order I got a vanilla tasting whey protein isolate, but the bag says salted caramel.”
“I ordered the Whey Isolate and received Pure whey protein.”
Quick answers
How much protein is in Bulk Pure Whey Isolate?
81g per 100g on the flavoured tub, which is 24g in a 30g scoop. Bulk markets it as 26g per serving, but the published panel says 24g, and that is the figure to plan around.
What is the difference between Bulk Pure Whey Isolate and Natural Pure Whey Isolate?
They are two different products. Pure Whey Isolate is sweetened with sucralose; Natural Pure Whey Isolate uses steviol glycosides and natural flavouring, which testers call sweeter and more divisive. Check which one is in your basket.
Is Bulk Pure Whey Isolate worth it over Pure Whey Protein?
Only if concentrate bloats you or you are cutting. A 30g scoop gives 24g of protein against 23g from the concentrate, so what you buy is 1.4g of sugar instead of 12g and 1g of fat instead of 3.5g.
Is it good for lactose intolerance?
It is better than the concentrate, but not lactose free. It carries 1.4g of sugar per 100g against 12g, and buyers report it is easier on the stomach, but it is still a milk product.
Alternatives to Bulk Pure Whey Isolate
Bulk
Pure Whey Protein
Bulk's other option, on a different protein base.
97p / 25g protein
MyProtein
Impact Whey Isolate
The same job from MyProtein, at a different price point.
£1.29 / 25g protein
Applied Nutrition
ISO XP
90g protein per 100g against 81g here, if density is what you are after.
£1.18 / 25g protein
Head-to-head reviews
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Label and copy last reviewed 8 September 2026 · Prices last fetched 17 September 2026