Bag · 5kg
£39.99
£0.22 / 25g protein
Protein prices,
honestly ranked.
Compare protein prices across the UK retailers we track
Cheapest today£0.22/25g
262+ brands tracked
Compare protein prices1,414 products · sorted by price-per-25gNew featureProtein FinderFind your new protein powder
Completely free • No account needed • Free discount codes
The UK's most comprehensive protein powder price comparison. 57 retailers covering whey protein powder, isolate, vegan, casein and mass gainer, every product ranked by cost per 25g of protein so you compare on facts, not marketing.
This week · editorial podium
Three deals we'd buy right now.
A preview of the compare page
Protein powder, compare prices and find the best value
Every type, every brand, every budget. Browse all 1,414 protein powders we compare across UK retailers, ranked by cost per 25g with filters, side-by-side comparison and price history.
Serious Shredz Bulk Meal Replacement · 500g - 4kg · 4 sizes
17g
90
2.9g
0.6g
£0.44per 25g protein
£47.89 for the 4kg·2 retailers·
Whey concentrate500g - 4kg · 4 sizes
Salted Caramel · 900g - 2kg · 2 sizes
21.3g
91
0.4g
0.3g
£0.88per 25g protein
£26.99 for the 900g·13 retailers·
Whey isolate900g - 2kg · 2 sizes
Salted Caramel · 900g - 5kg · 6 sizes
19g
97
0.7g
1.8g
£0.34per 25g protein
£30.00 for the 2.88kg·1 retailer·
Vegan900g - 5kg · 6 sizes
Unflavoured · 500g - 4kg · 4 sizes
20g
89
1.4g
0.4g
£0.82per 25g protein
£104.99 for the 4kg·1 retailer·
View deal
Get 12% off your order
Casein500g - 4kg · 4 sizes
Vanilla · 2.03kg - 4.3kg · 2 sizes
11.3g
100
8.8g
2g
£0.88per 25g protein
£68.94 for the 4.35kg·3 retailers·
Mass gainer2.03kg - 4.3kg · 2 sizes
Various · 375g - 500g · 2 sizes
21.7g
90
0.3g
0.1g
£1.38per 25g protein
£17.99 for the 375g·5 retailers·
Clear whey375g - 500g · 2 sizes
Prices checked within the last 6 hours. Rankings update automatically.
Compare all protein pricesAlso compareNew category
Vitamins & Supplements, compare and save money
Find the lowest prices on vitamins and supplements across the UK's top retailers. Protein is our core, but honest price comparison extends to everything on the health shelf.
Strength & power
Creatine
Ranked by cost per 5g. Monohydrate, HCL, Creapure-certified.
Ranked by cost / 5g112tracked
Compare creatine
Energy & focus
Pre-workout
Stim and stim-free formulas, with full caffeine dosage disclosure.
Ranked by mg caffeine / £94tracked
Compare pre-workout
Recovery
Post-workout
Protein + carbs + EAA blends for faster recovery.
Ranked by cost / servingsoontracked
Compare post-workout
Amino acids
BCAAs & EAAs
Branched-chain and essential amino formulas by leucine content.
Ranked by leucine / £85tracked
Compare amino acids
WellnessNew vertical
Vitamins & everyday wellness, compared
Multivitamins, omega 3, probiotics, magnesium and herbal supplements from DR.VEGAN, MyProtein, Bulk, Bio-Synergy and Amazon UK. Ranked by cost per month.
480
products tracked
Discount codes · refreshed every 6h
Discount codes,
checked every
six hours.
When a retailer opens a code, we catch it within six hours and rank it by how deep the discount is, not by how big the retailer's ad budget is.
03 - Tools
Built for buyers,
not browsers.
01
Compare by price per 25g
Filter 1,414 products by true cost per serving. Not list price, not RRP, what you actually pay per 25g of protein.
Open tool02
Protein intake calculator
Work out how much protein you need based on weight, activity level and goal. Then jump straight to the cheapest match.
Open tool03
Deals & discount codes
Discount codes and the biggest price drops across 57 retailers, ranked by depth of discount, not ad budget.
Open tool04 - By brand
Compare every brand.
Or jump to Amazon.
05 - Methodology
Comparison built on real data, not marketing.
Most protein comparison sites rank by affiliate commission. We rank by what you'd actually pay at the till. Here's the difference.
(i)
Price-per-25g, not RRP
Every product is normalised to the true cost per 25g of actual protein content, the only number that matters when you're deciding between a 1kg bag and a 5kg tub.
(ii)
57 retailers, read at source
We don't wait for press releases. Prices are read from the retailer's own page, and every one is shown with the date we checked it.
(iii)
Zero pay-for-placement
Rankings are purely algorithmic. We earn from affiliate clicks, never from brands paying to move up the list.
(iv)
Published methodology
Every calculation and data source is documented. If our numbers are wrong, you'll know exactly why.
06 - Why we're different
WheyWise vs typical
protein comparison sites.
WheyWise
How we rank protein
- Cost per 25g of protein - apples-to-apples
- Pulls prices from UK retailers, each shown with its check date
- Rankings are 100% data-driven, never paid
- Shows real stock status on every retailer
- Full nutrition data on every product page
- Completely free, no account, no email wall
Typical comparison sites
How most sites rank protein
- Sticker price only - no normalisation for size or protein
- Narrow retailer coverage, prices often weeks stale
- Sponsored rows push paid brands to the top
- Stock status missing or unreliable
- No nutrition breakdown, just a price and a buy button
- Email-gated content and newsletter signup walls
07 - FAQ
Frequently asked questions
WheyWise tracks over 1,900 products across the UK retailers we list. We normalise every whey protein powder, isolate, vegan, casein and mass gainer to cost per 25g of protein - so you can compare a high quality isolate against a budget concentrate on equal terms, regardless of bag size or brand.
We cover every major protein source: whey concentrate and whey isolate for fast absorption and muscle mass support, plant based options like pea and soy protein for vegan and dairy-free diets, casein for slow-release overnight recovery, and mass gainers for those looking to add extra protein and calories for building muscle.
Yes - completely free. No account needed, no paywalls. We earn a small referral fee when you buy through a retailer link, at no extra cost to you. This keeps the protein supplement comparison tool running without ads or sponsored rankings.
Amazon prices are refreshed daily. Other retailers are checked less often, so every price on the site is displayed with the date it was checked and you can judge for yourself how current it is. Discount codes from MyProtein, Bulk, Protein Works and dozens more are refreshed every six hours.
Buying through a retailer link earns us a small referral fee - at no extra cost to you.