MyProteinWhey isolate
Myprotein Impact Whey Isolate
Prices checked . Re-checked daily from retailers' own product pages. Label checked .
MyProtein Impact Whey Isolate costs £1.29 per 25g of protein in the 2.88kg pack (£121.99 at MyProtein). That makes it the 17th cheapest of 21 reviewed animal-protein powders with a live price. It is a whey isolate with 82g of protein per 100g and 25g in a 30g scoop, on the manufacturer's label.
- Best for
- People cutting, or who find concentrate heavy, who want 82g of protein per 100g with 1.9g of sugar.
- Skip if
- You avoid soy, since the emulsifiers include soya lecithin as well as sunflower.
- Watch out
- The 1kg bag is now 900g, so compare cost per 25g of protein rather than the price of a bag.
- Protein / 100g
- 82g
- Per 30g scoop
- 25g
- Per 25g protein
- £1.29
- 2.88kg pack
- £121.99
Our verdict on MyProtein Impact Whey Isolate
Myprotein Impact Whey Isolate suits buyers who are cutting or find concentrate heavy: it carries 82g of protein per 100g, about 25g (24.6g on the label) per 30g scoop, with 1.9g of sugar and 0.9g of fat per 100g. That is a clear step up from Impact Whey's 72g. The caveat is value. Buyers report steep 2026 price rises and the 1kg bag is now 900g, so compare cost per 25g of protein before reordering out of habit. It contains soya lecithin, so it is not soy free.
How the price compares
MyProtein Impact 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 MyProtein Impact 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 |
|---|---|---|---|---|
| MyProtein | 2.88kg | £121.99 | £1.29 | View deal ↗ |
| Amazon UK | 2.5kg | £116.99 | £1.43 | View deal ↗ |
Sold in 500g, 900g, 2.5kg, 5kg. 2 partner retailers stock a 400g or larger pack.
Price history, 2.88kg pack
Lowest partner price for the 2.88kg pack each day, last 90 days.
Pros and cons
Pros
- 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
Cons
- 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
Nutrition and ingredients
From the manufacturer’s published label (Source). 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.
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 | 25g |
| 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 |
- Protein source
- Whey protein isolate (milk), 96% of the powder
- Sweeteners
- Sucralose
- Emulsifier
- Soya lecithin and sunflower lecithinBoth 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
- Flavours
- 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
- Informed Sport: no evidence found. 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
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.
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
- Price is the main complaint, with buyers quoting their own 2026 rises and noting the 1kg bag has shrunk to 900g.
“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.”
Quick answers
How much protein is in Myprotein Impact Whey Isolate?
82g per 100g on the published label, which is about 25g of protein (24.6g on the label) in a 30g scoop. Myprotein publishes one panel for all flavours, so unflavoured will be a little higher.
Is Impact Whey Isolate worth the extra over Impact Whey?
Yes, if you are cutting or dairy sits heavy on you. Protein rises from 72g to 82g per 100g, sugar drops from 4.5g to 1.9g and fat from 7g to 0.9g. If you are bulking, the concentrate does the same job for less.
Why has Myprotein Impact Whey Isolate got more expensive?
Buyers report rises of 30% and more across 2026, and the 1kg bag has become 900g. A global whey supply squeeze is behind some of it. Compare on cost per 25g of protein at the pack size in your basket.
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.
Alternatives to MyProtein Impact Whey Isolate
Bulk
Pure Whey Isolate
The same job from Bulk, at a different price point.
£1.30 / 25g protein
MyProtein
Impact Whey Protein
MyProtein's other option, on a different protein base.
90p / 25g protein
Applied Nutrition
ISO XP
90g protein per 100g against 82g 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 26 October 2026