MyProtein Impact Whey
- Whey concentrate
- 72g
- Protein / 100g
- 21.6g
- Per 30g scoop
- 91p
- Per 25g protein
- £113.99
- 4350g pack
Our verdict
Scored on the label and the price, not on how it tastes.
- Discounted so regularly that the list price is rarely what anyone pays
- Pack sizes from 250g to 4.5kg, so trial sizes genuinely exist
- The widest flavour range in the UK market
- An unflavoured version exists, with a shorter ingredient list
- The list price is not a real price. Discounting is continuous, and buyers report waiting for 50% or more
- Long-term buyers report protein content falling over the years, and pack sizes shrinking from 1kg to 900g and 5kg to 4.5kg
- Sweetened with both sucralose and acesulfame K
- Batch-to-batch consistency is the most persistent complaint we found, across years of threads
Read the full verdict
Impact Whey is the UK reference point for cheap whey concentrate. The single most useful thing to know before buying is that its list price is close to meaningless. Discounting is continuous and deep, and experienced buyers say plainly that they will not buy above 50% off. Judge it on the discounted price in the table below, not the RRP, and treat any comparison that uses its list price as misleading.
Where to buy MyProtein Impact Whey Protein
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.
How it scored
How we scoreFour categories, each out of 25, every one taken from the label or the live partner price.
72g per 100g
91p per 25g protein
4.5g sugar, 7g fat per 100g
none found
Nutrition
Taken from the manufacturer’s published label. Source.
Flavoured Impact Whey sits around 72g per 100g. The unflavoured version is higher, and long-term buyers report it dropping over the years from roughly 80 to 82g per 100g to about 75g. Check the pack you are buying rather than assuming.
| Nutrient | Per 100g | Per 30g |
|---|---|---|
| Protein | 72g | 21.6g |
| Energy | 383 kcal | 115 kcal |
| Carbohydrate | 6.9g | 2.1g |
| of which sugars | 4.5g | 1.4g |
| Fat | 7g | 2.1g |
| of which saturates | 4.4g | 1.3g |
| Salt | 0.4g | 0.1g |
Ingredients and formulation
- 01Whey protein concentrate
A straight whey concentrate, which is what keeps the price down. Not an isolate, and not a blend.
Sucralose, Acesulfame K
Soy lecithin
250g · 1kg · 2.5kg · 4.5kg
The widest flavour range in the UK market by a distance, plus an unflavoured version. Quality varies noticeably between them.
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 operates its own testing programme and publishes results, but we found no Informed Sport or Informed Choice listing for standard Impact Whey.
Made by
MyProtein, a brand of THG plc, ManchesterTHG listed publicly in 2020. Buyers connect the pricing behaviour since then to that listing.
Taste and what buyers report
Quoted and linked, so you can read the full thread.
“The standard impact whey in unflavoured used to be in region of 80 to 82g per 100g. Now, unflavoured is 75g per 100g.”
“They just drive the display price up and then have sales to pull it back down slightly.”
“Chocolate Smooth does not taste like powder unlike most, it tastes like a genuine chocolate drink.”
“My most recent order is incredibly chalky tasting, and leaves a strange mouth feel.”
What the maker does not publish
- Reported protein content varies between the flavoured and unflavoured versions, and buyers report it changing over time.
- Batch inconsistency recurs across years of buyer threads, without MyProtein publicly addressing it.
Alternatives worth a look
Frequently asked questions
How much protein is in MyProtein Impact Whey?
Flavoured Impact Whey is around 72g per 100g, or roughly 21g in a 30g scoop. The unflavoured version is higher. Long-term buyers report the unflavoured figure falling from about 80 to 82g per 100g to about 75g, so check the pack.
Is MyProtein Impact Whey worth buying at full price?
Almost nobody does. Discounting is continuous and deep enough that regular buyers treat anything under 50% off as a bad deal. Judge it on the offer price, not the RRP.
Why has MyProtein got more expensive?
UK buyers point at pack sizes shrinking, 1kg to 900g and 5kg to 4.5kg, alongside list-price rises. There is also a genuine global whey supply squeeze and a broad protein demand spike in 2026, so both explanations carry some weight.
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Open the Protein FinderLast updated 19 August 2026