Protein Works

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

How the numbers stack up against the price

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 24 reviews

Median £1.10

  • Protein Works Whey Protein 360 - GOLD Innovation
    59p
  • NXT Nutrition Beef Protein Isolate
    74p
  • Applied Nutrition Critical Whey
    92p
  • Bulk Pure Whey Protein
    97p
  • MyProtein Impact Whey Protein
    £1.01
  • PER4M Nutrition Whey Protein
    £1.03
  • Protein Works Whey Protein 360 - PLATINUM Innovation
    £1.03
  • USN Blue Lab Whey
    £1.05
  • PhD Nutrition Diet Whey
    £1.10
  • Scitec Nutrition 100% Whey Protein Professional
    £1.11
  • Warrior Whey
    £1.13
  • PER4M Nutrition Isolate Zero
    £1.15
  • MyProtein Impact Diet Whey
    £1.21
  • MyProtein Impact Whey Isolate
    £1.23
  • Applied Nutrition ISO XP
    £1.23
  • Bulk Pure Whey Isolate
    £1.30
  • Bulk Clear Whey Isolate
    £1.48

Cheapest in-stock listing at a partner retailer, for packs of 400g and over. MyProtein Clear Whey Protein, Protein Works Vegan Protein 360 - GOLD Innovation, Protein Works Vegan Protein 360 - PLATINUM Innovation, Protein Works Vegan Pea Protein - BLACK Innovation, Protein Works 100% Micellar Casein - BLACK Innovation, Protein Works Diet Whey Protein Isolate - BLACK Innovation, Protein Works Clear Diet Whey Protein - GOLD Innovation have no partner listing in stock, so they carry 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

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.

Nutrition per 100g and per serving
NutrientPer 100gPer 25g
Protein86g21.5g
Energy365 kcal91 kcal
Carbohydrate4g1.0g
of which sugars2.3g0.6g
Fat0.6g0.1g
of which saturates0.5g0.1g
Fibre0.2g0.1g
Salt0.49g0.1g

Ingredients and formulation

Protein sources, in label order

  1. 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.

Informed SportNo evidence found

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.

59p / 25g protein

Protein Works

100% Micellar Casein - BLACK Innovation

Protein Works's other option, on a different protein base.

80g protein / 100g

Applied Nutrition

ISO XP

The same job from Applied Nutrition, at a different price point.

£1.23 / 25g protein

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Last updated 20 August 2026