First
Cheapest overallPure Source Nutrition
PSN Soy Protein 5kg Powder77 bought this week
77bought this week90% protein · 27g / 25g serving
Bag · 5kg
£36.99
£0.21 / 25g protein
Prices updated weekly|3,496 products tracked|98 UK retailers|Live discount codes
Cheapest today£0.07/25g
264+ brands tracked
Protein prices, honestly ranked.
Compare protein prices across 90+ UK retailers
Completely free • No account needed • Free discount codes
The UK's most comprehensive protein powder price comparison. 98 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.
3,496
Products tracked
98
UK retailers
264+
Brands tracked
Weekly
Price refresh
This week · editorial podium
Three deals we'd buy right now.
Hand-picked by our nutrition team every Monday, 07:00. Scored on £/25g protein, clean-label, and weekly velocity.
A preview of the compare page
Protein powder, compare prices and find the best value
Every type, every brand, every budget. Browse all 3,496 protein powders we compare across UK retailers, ranked by cost per 25g with filters, side-by-side comparison and price history.
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 / 5g271tracked
Compare creatine
Energy & focus
Pre-workout
Stim and stim-free formulas, with full caffeine dosage disclosure.
Ranked by mg caffeine / £184tracked
Compare pre-workout
Recovery
Post-workout
Protein + carbs + EAA blends for faster recovery.
Ranked by cost / serving1tracked
Compare post-workout
Amino acids
BCAAs & EAAs
Branched-chain and essential amino formulas by leucine content.
Ranked by leucine / £227tracked
Compare amino acids
Live · updated every 6h
Price drops,
tracked in
real time.
When a retailer cuts a price or 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.
04-10%View
Myprotein
You've saved an extra #PERCENT off your order! Save an extra 10% off £35 spend or extra 15% off £65 spend, in our up to 50% off. Use code MORE at basket!
05-10%View
Bulk
Quick Buy NEW Everyday Super Greens Mixed Berry 300g (52) £47.99 £37.99 Extra 10% off selected sizes/flavours. Use code: VITS10
03 — Tools
Built for buyers,
not browsers.
01
Compare by price per 25g
Filter 3,496 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
Live deals & price drops
Watch any product across 98 retailers. We catch price cuts within six hours and rank them 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)
98 retailers, crawled weekly
We don't wait for press releases. If Bulk drops a price, it's in the ranking by our next crawl.
(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 90+ UK retailers, refreshed weekly
- 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 90+ UK retailers every week. 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.
Prices are checked weekly across all tracked retailers. We also surface live discount codes from MyProtein, Bulk, The Protein Works, and dozens more — so you always find the best deal whether you need an inexpensive protein supplement or a premium isolate.
Buying through a retailer link earns us a small referral fee — at no extra cost to you.