Buying protein powder in the UK should be straightforward, but it isn't. Prices vary wildly between retailers, discount codes come and go, and bag sizes make it hard to compare like for like. I found myself opening MyProtein, Bulk, Amazon, and Holland & Barrett in separate tabs, trying to work out which one was actually cheapest per gram of protein — and losing track halfway through.
There was no single place that compared real prices across all the major UK retailers, normalised by protein content, with active discount codes included. So I built one. That became WheyWise.
What WheyWise does
WheyWise is a free UK protein powder price comparison tool. It currently tracks over 1,900 products across 85+ brands — covering whey concentrate, whey isolate, vegan, casein, and mass gainer categories.
Every product is normalised to a cost per 25g of protein, so you can compare a 1kg bag of isolate against a 2.5kg bag of concentrate on equal terms. The cheapest option rises to the top regardless of brand or bag size.
Where retailers are running discount codes, those are surfaced alongside the price so you can see the real cost before you buy. Check the latest protein powder deals for everything currently discounted.
How the data works
Automated price checks pull data from the major UK protein retailers every week. The data is stored, normalised by weight and protein content, and published to the site. If a price changes or a product goes out of stock, that updates automatically on the next check.
For a deeper look at the methodology, read how WheyWise tracks UK protein prices.
What makes it different
There are no paid placements, no boosted listings, and no sponsored rankings. The only factor that determines where a product appears is its price per gram of protein. If a lesser-known brand is cheaper than a household name, it ranks higher — that is the entire point.
WheyWise is also completely free. No sign-ups, no paywalls, no ads. You can compare every product on the site without creating an account or handing over an email address.
What's available now
The site has grown well beyond a basic comparison table. Here is what you can use today:
- Price comparison tables — filterable by category (whey, isolate, vegan, casein, mass gainer)
- 90-day price history charts on every product page — so you can see whether a "sale" price is genuinely a sale
- Deals and discount codes — updated weekly across all tracked retailers
- Individual product pages with retailer-by-retailer pricing, stock status, and nutritional data
- Buying guides and price analysis — data-driven articles covering everything from cheapest protein per gram to brand comparisons
How you can help
WheyWise is free to use and will stay that way. If you want to support the project, the simplest way is to use the discount and referral codes listed on the site when you buy. They save you money on your order and send a small referral fee back to WheyWise — it costs you nothing extra.
If you spot a missing product, an incorrect price, or a retailer that should be tracked, the contact page comes straight to me and I act on every message.
The goal is simple: make it easier and cheaper to buy protein powder in the UK. If WheyWise has saved you time or money, share it with someone who buys protein — that is the best way to help it grow.
