Myprotein Impact Whey Isolate
On the label this is a strong isolate and a genuine step up from Impact Whey: 82g protein per 100g against 72g, 1.9g of sugar against 4.5g, and under 1g of fat.
- Lean macros
- Low lactose
- 82g
- Protein / 100g
- 25g
- Per 30g scoop
- £1.22
- Per 25g protein
- £199.49
- 5.00kg pack
How the numbers stack up against the price
£1.22 buys 25g of protein here, which makes it the 17th cheapest of the 24 powders we have reviewed, behind MyProtein Impact Whey Protein at £1.09, and 28p over the median.
If you are cutting, or concentrate makes you feel heavy, this is the obvious tub in the Myprotein range. The problem in 2026 is not the powder, it is the arithmetic. Buyers are posting their own before-and-after receipts, one of them a 32% rise across three months, and the 1kg bag has quietly become 900g. Our own price data holds both 1kg and 900g variants, which is what that looks like from the outside. None of that makes it a bad isolate. It does mean you should work out your cost per 25g of protein at the size actually in your basket, and check what the same money buys from Bulk before you reorder out of habit.
Cost per 25g of protein, across our 24 reviews
Median 94p
- Protein Works Vegan Pea Protein - BLACK Innovation39p
- Protein Works Vegan Protein 360 - GOLD Innovation44p
- Protein Works Vegan Protein 360 - PLATINUM Innovation54p
- Bulk Pure Whey Protein70p
- Protein Works Whey Protein 360 - PLATINUM Innovation71p
- Protein Works Whey Protein 360 - GOLD Innovation72p
- PhD Nutrition Diet Whey73p
- NXT Nutrition Beef Protein Isolate74p
- Protein Works 100% Micellar Casein - BLACK Innovation82p
- PER4M Nutrition Whey Protein85p
- PER4M Nutrition Isolate Zero86p
- MyProtein Impact Diet Whey92p
- MyProtein Clear Whey Protein96p
- USN Blue Lab Whey100p
- Bulk Pure Whey Isolate£1.05
- MyProtein Impact Whey Protein£1.09
- MyProtein Impact Whey Isolate£1.22
- Applied Nutrition ISO XP£1.24
- Applied Nutrition Critical Whey£1.25
- Warrior Whey£1.26
- Bulk Clear Whey Isolate£1.33
- Protein Works Clear Diet Whey Protein - GOLD Innovation£1.37
- Scitec Nutrition 100% Whey Protein Professional£1.49
- Protein Works Diet Whey Protein Isolate - BLACK Innovation£1.56
Cheapest in-stock listing at a partner retailer, for packs of 400g and over.
A 96% isolate with nothing blended in behind it, which is what puts it 10g per 100g clear of Impact Whey. The remaining 4% is emulsifier, flavouring and sweetener.
The 1kg Whey Isolate bags have now been reduced to 900g.
What the label gets right, and wrong
Strengths
- 82g protein per 100g, which is 25g in a 30g scoop with almost nothing else along for the ride
- 1.9g of sugar and 0.9g of fat per 100g, so it fits a cut without any accounting
- The widest flavour range of any UK isolate, plus unflavoured for cooking
- Buyers report it mixing cleanly with no lumps, which is not a given at this protein level
Watch-outs
- Multiple independent buyers report steep 2026 price rises, one quoting £37.83 in May against £49.04 in August
- The 1kg bag is now 900g. Compare on cost per 25g of protein, not on the price of a bag
- Contains soya lecithin as well as sunflower, so it is not a soy-free option
- One buyer reports a tub stating 22g per serving with a different ingredient list from the published one
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 |
|---|---|---|---|---|
| MyProtein | 5000g | £199.49 | £1.22 | View deal ↗ |
| Amazon UK | 2500g | £124.79 | £1.52 | View deal ↗ |
2 partner retailers stock a 400g or larger pack of this product.
Price history
What a scoop actually contains
Taken from the manufacturer’s published label. Source.
Our own scraped row says 79g per 100g. The published label says 82g. We use the label. At least one buyer reports receiving a tub stating 22g per serving with a different ingredient list, so check the back of the bag you get rather than trusting any figure typed on a website, including this one.
| Nutrient | Per 100g | Per 30g |
|---|---|---|
| Protein | 82g | 24.6g |
| Energy | 361 kcal | 108 kcal |
| Carbohydrate | 6.1g | 1.8g |
| of which sugars | 1.9g | 0.6g |
| Fat | 0.9g | 0.3g |
| of which saturates | 0.4g | 0.1g |
| Salt | 0.65g | 0.2g |
Ingredients and formulation
Protein sources, in label order
- 01Whey protein isolate (milk), 96% of the powder
Sweeteners and emulsifier
Sucralose
Soya lecithin and sunflower lecithin
Both are present, so this is not a soy-free product. Bulk Pure Whey Isolate uses sunflower lecithin alone if that matters to you.
Pack sizes
500g · 900g · 2.5kg · 5kg
The same very large flavour range as Impact Whey, and the same variability. Chocolate brownie and vanilla get named positively below; there is no flavour with a consistent bad reputation the way there is on some rivals.
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.
Myprotein puts its batch-tested products in the Impact Whey Elite line. Standard Impact Whey Isolate is not automatically covered, and nothing on the product page claims it is.
Made by
MyProtein, a brand of THG plc, Manchester
Taste and what buyers report
Quoted and linked, so you can read the full thread.
“May 2026: Whey Isolate £37.83 / August 2026: Whey Isolate £49.04 / Price increase in 3 months: 32%!”
“The 1kg Whey Isolate bags have now been reduced to 900g.”
“Brought the chocolate brownie flavoured whey isolate. Great taste, blends well no lumps.”
“I have had seen noticeable gains in size and strength utilising impact whey isolate.”
“The tub I received contained 22g of protein per serving with a different ingredient list.”
“The whey isolate left me with unpleasant bloating.”
What the maker does not publish
- Myprotein has not publicly addressed the 1kg to 900g change on the product page, and both sizes are still in circulation at other retailers.
- We could not establish whether the buyer report of a 22g per serving tub is an older formulation, a different market, or a mislabelled batch.
- Myprotein publishes one panel rather than one per flavour, so unflavoured will be higher in protein per 100g than the 82g quoted here.
Questions buyers ask
The things people search for about MyProtein Impact Whey Isolate, answered from the label and the live partner prices rather than from the brand’s own copy.
How much protein is in Myprotein Impact Whey Isolate?
82g per 100g on the published label, which is 25g of protein in a 30g scoop. Our scraped catalogue says 79g; the label is the figure we use.
Is Impact Whey Isolate worth the extra over Impact Whey?
If you are cutting or dairy sits heavy on you, yes. You go from 72g protein per 100g to 82g, sugar drops from 4.5g to 1.9g and fat from 7g to 0.9g. If you are bulking and eating in surplus anyway, the concentrate does the same job for less and the extra carbs and fat are not costing you anything.
Why has Myprotein Impact Whey Isolate got more expensive?
Buyers are quoting rises of 30% and more across 2026 and pointing at the 1kg bag becoming 900g. There is also a genuine global whey supply squeeze behind some of it. Either way, compare on cost per 25g of protein at the pack size in your basket rather than on the headline price.
Does Impact Whey Isolate contain soy?
Yes. The emulsifiers are soya lecithin and sunflower lecithin, and the allergen line lists milk and soya. If you are avoiding soy, Bulk Pure Whey Isolate uses sunflower lecithin only.
Reviewed next to
Bulk
Pure Whey Isolate
The same job from Bulk, at a different price point.
£1.05 / 25g protein
MyProtein
Impact Whey Protein
MyProtein's other option, on a different protein base.
£1.09 / 25g protein
Applied Nutrition
ISO XP
90g protein per 100g against 82g here, if density is what you are after.
£1.24 / 25g protein
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Last updated 8 September 2026