Quick answer
Anyone shopping for UK whey concentrate on a budget will keep running into two names: MyProtein Impact Whey and Protein Works Whey 80 (BLACK). Both are direct-to-consumer budget whey concentrates, both run near constant discount codes, both ship from UK warehouses, and both have large customer bases. Here is how they actually compare on ProteinDeals data pulled today.
Price per 100g
MyProtein Impact Whey has been cheaper per 100g on average over the last 14 days. Its price floor during Q2 sales sits around £2.42 per 100g, with 1kg bags starting from £22.99. TPW Whey 80 floors at roughly £2.61 per 100g, with 1kg bags from £17.89. Both have moved broadly sideways quarter on quarter, with MyProtein Impact Whey concentrate actually down 11.5% against Q1 averages per our Q2 2026 Price Index, while TPW is up a mild 3.5%.
On raw bag price, TPW looks cheaper at £17.89 for 1kg against MyProtein's £22.99. But per 100g of actual protein, which is the number that matters, MyProtein has the edge right now.
Protein content
This is where TPW pulls ahead on the spec sheet. Whey 80 BLACK carries 74g of protein per 100g, against MyProtein Impact Whey's 72g per 100g. Both labels are honest and batch-tested, with no wild filler claims. The 2g difference is small in practice, but it reflects TPW spending a bit more on concentrate purity. Fat and carbs track almost identically, at 5.4g fat and 8.6g carbs for TPW versus 5.9g and 8.9g for MyProtein.
Flavours and sizes
MyProtein dominates on range. Impact Whey lists 48 distinct flavours across reformulations and seasonal specials, with bag sizes running from 345g up to 5kg for serious bulk buyers. Anyone who values choice, or wants to split a 5kg bag across a shared household, gets a real advantage here.
TPW Whey 80 is narrower, with five flavours and four bag sizes (500g, 1kg, 2kg, 4kg). TPW users tend to point to taste consistency and cleaner sweeteners as the trade-off for fewer SKUs, fewer reformulations, and less inventory churn. ProteinDeals rates both at 70/100 on taste, so that category is a wash.
Community perspective
What others are saying
Anecdotes are useful for spotting recurring taste, texture and convenience issues, but they are not evidence of effectiveness.
Discount codes
Both brands lean heavily on discount codes. The listed RRP on either site is essentially fictional, since nobody actually pays full price. What matters is the floor price, which is what ProteinDeals tracks.
- 1
MyProtein: near-constant stacked codes plus 2 to 3 headline sales per quarter. Codes are easy to find, but the stated "sale" percentage is usually measured off an inflated RRP.
- 2
TPW: fewer but deeper codes (50 to 60% off RRP on headline sales), combined with a more honest everyday price. TPW runs fewer permanent discount events, but the ones it does run often stack with a free shaker or sample offer.
Cheapest Myprotein Whey
Essential Whey Protein Shake
MyProtein · 1kg
Which should you buy?
Honestly, check both before you buy and let the price decide. MyProtein is the clear pick if you want the widest flavour range, 5kg bulk bags, or the lowest cost per gram of protein during a headline sale. TPW is the pick if you value higher protein density per 100g (74g versus 72g), more honest everyday pricing, or you have been burned by MyProtein reformulations in the past.
On our scorecard, MyProtein Impact Whey totals 78/100 (with a value score of 95), and TPW Whey 80 totals 74/100 (value 82). The value score reflects typical price rather than best-case sale price, which is why MyProtein nudges ahead despite the narrower spec-sheet lead.
For live prices and current discount codes across every UK retailer tracked, use the live comparison table sorted by cost per 25g of protein. For a direct head-to-head comparison tool, see protein reviews, or compare any two products directly via protein comparison. For a broader alternative list, read MyProtein alternatives UK.