Protein Works Diet Whey Protein Isolate - BLACK Innovation
This is the product to buy from Protein Works if what you want is protein and very little else: 86g per 100g, 0.6g of fat, 4g of carbohydrate, 0.49g of salt, and an ingredient list whose protein section is one item long.
- Cutting
- Lean macros
- Low lactose
- 86g
- Protein / 100g
- 22g
- Per 25g scoop
- £1.56
- Per 25g protein
- £214.99
- 4.00kg pack
Mixed on the numbers
Scored on the label and the price, not on how it tastes. How we score.
How the numbers stack up against the price
£1.56 buys 25g of protein here, which makes it the 17th cheapest of the 18 powders we have reviewed, behind Protein Works Clear Diet Whey Protein - GOLD Innovation at £1.37, and 70p over the median.
It is also the only genuinely soy-free whey they sell. The price is the catch and it is a big one. £1.56 per 25g of protein at the best pack size is more than double the 360 blends and dearer than most mainstream UK whey isolates, and it climbs to £2.03 on the smaller bags. The formulation deserves the praise; the price list does not.
Cost per 25g of protein, across our 18 reviews
Median 86p
- Protein Works Vegan Pea Protein - BLACK Innovation39p
- Protein Works Vegan Protein 360 - GOLD Innovation44p
- Protein Works Vegan Protein 360 - PLATINUM Innovation54p
- Protein Works Whey Protein 360 - PLATINUM Innovation71p
- Protein Works Whey Protein 360 - GOLD Innovation72p
- PhD Nutrition Diet Whey73p
- PER4M Nutrition Whey Protein75p
- Protein Works 100% Micellar Casein - BLACK Innovation82p
- PER4M Nutrition Isolate Zero86p
- MyProtein Impact Whey Protein91p
- Scitec Nutrition 100% Whey Protein Professional93p
- USN Blue Lab Whey100p
- Applied Nutrition Critical Whey£1.12
- Applied Nutrition ISO XP£1.16
- Warrior Whey£1.19
- Protein Works Clear Diet Whey Protein - GOLD Innovation£1.37
- Protein Works Diet Whey Protein Isolate - BLACK Innovation£1.56
Cheapest in-stock listing at a partner retailer, for packs of 400g and over. NXT Nutrition Beef Protein Isolate has no partner listing in stock, so it carries no figure.
A single-source whey protein isolate with sunflower lecithin as the only emulsifier. No soy protein, no blend, no vitamin premix. This is the one product in the Protein Works range that is simply whey isolate, which is why it reads 86g protein per 100g against the 68g and 69g of the 360 blends.
What the label gets right, and wrong
Strengths
- 86g of protein per 100g, the highest in the Protein Works range
- 0.6g of fat and 4g of carbohydrate per 100g
- Single protein source with sunflower lecithin, and genuinely soy free
- 0.49g of salt per 100g, a fraction of the vegan line
Watch-outs
- £1.56 per 25g of protein at best, rising to £2.03 on smaller bags
- More than double the cost per gram of protein of the 360 blends
- Protein per 100g swings 83g to 88.3g by flavour
- No published third-party batch testing
Where to buy it
Ordered by cost per 25g of protein, because pack sizes and protein densities differ enough that a headline price on its own does not tell you which is better value.
| Retailer | Size | Price | Per 25g | Go to retailer |
|---|---|---|---|---|
| Protein Works | 4000g | £214.99 | £1.56 | View deal ↗ |
One partner retailer stocks a 400g or larger pack of this product.
Price history
How it scored
Four categories, each out of 25, every one taken from the label or the live partner price.
86g per 100g
£1.56 per 25g protein
2.3g sugar, 0.6g fat per 100g
none found
What a scoop actually contains
Taken from the manufacturer’s published label. Source.
The page publishes 83g, 88g and 88.3g panels on other flavours. The panel here matches the 86g we hold from our own scrape.
| Nutrient | Per 100g | Per 25g |
|---|---|---|
| Protein | 86g | 21.5g |
| Energy | 365 kcal | 91 kcal |
| Carbohydrate | 4g | 1.0g |
| of which sugars | 2.3g | 0.6g |
| Fat | 0.6g | 0.1g |
| of which saturates | 0.5g | 0.1g |
| Fibre | 0.2g | 0.1g |
| Salt | 0.49g | 0.1g |
Ingredients and formulation
Protein sources, in label order
- 01Whey protein isolate (milk)
Sweeteners and emulsifier
Sucralose
Sunflower lecithin
Sunflower rather than soy, and unlike the 360 blends there is no soy protein either, so this is genuinely a soy-free product.
Pack sizes
500g · 1kg · 2kg · 4kg
Flavour choice moves the panel more than usual here, from 83g to 88.3g protein per 100g.
Third-party testing
Certification is per programme and often per flavour or per batch, so a badge on one product does not carry across a brand’s whole range.
No batch-testing claim is published for this product and we found none elsewhere.
Made by
Protein Works, produced at their own UK facility
What the maker does not publish
- Protein Works does not state whether the isolate is cross-flow microfiltered or ion exchange.
- We found no product-level buyer reviews we could attribute and link.
Questions buyers ask
The things people search for about Protein Works Diet Whey Protein Isolate - BLACK Innovation, answered from the label and the live partner prices rather than from the brand’s own copy.
How much protein is in Protein Works Diet Whey Protein Isolate?
86g per 100g on the most common flavour panel, or 22g in a 25g scoop. Other flavours run from 83g to 88.3g.
Is Protein Works Diet Whey Protein Isolate soy free?
Yes. The protein source is whey protein isolate alone and the emulsifier is sunflower lecithin. That makes it the soy-free option in their whey range, unlike the 360 blends which use soy protein isolate.
Is it worth the price?
On formulation it is the best whey they sell. On price it is the worst value: £1.56 per 25g of protein against 72p for Whey Protein 360 GOLD. If the soy or the leanness matter to you it is defensible; otherwise it is not.
Reviewed next to
Protein Works
Whey Protein 360 - GOLD Innovation
Protein Works's other option, on a different protein base.
72p / 25g protein
Protein Works
100% Micellar Casein - BLACK Innovation
Protein Works's other option, on a different protein base.
82p / 25g protein
Applied Nutrition
ISO XP
The same job from Applied Nutrition, at a different price point.
£1.16 / 25g protein
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Last updated 20 August 2026