Top-three picks across the goals UK shoppers actually search for. Pulled live from 98+ UK retailers, ranked strictly by cost per 25g of protein, refreshed every scrape. No sponsored rankings.
We rank every protein in our database by a single number: how much it costs per 25g of actual protein. That normalises bag size, protein density, and brand markup so a 1kg vegan blend competes fairly with a 5kg whey concentrate. The leader is the absolute cheapest in stock right now; the runner-up cites its gap to that leader; the third pick earns its slot on a non-price edge (bag size, retailer breadth, or clean-label score).
View the full cheapest table
Highly refined 90% soy protein isolate, GMO-free and lower-flatulence than basic soy concentrates, offered in a budget-friendly 5kg bag.
Myprotein dominates UK protein searches, but the direct-to-consumer model that made it cheap is now copied by Bulk, Pure Source Nutrition, and The Bulk Protein Company. The picks below are non-Myprotein UK brands sitting in the same price band, with each card citing its £/25g against Myprotein Impact Whey so the comparison is explicit rather than implied. Cross-listed products that already appear above are skipped automatically.
View Myprotein vs Bulk comparison
Meal-replacement-style diet whey sold in a 4.4kg bucket with 19g protein per serving, positioned for calorie-controlled cuts rather than pure muscle gain.
Plant protein has caught up with whey for muscle synthesis when blended across multiple sources, so a quality pea-rice or pea-rice-hemp blend now delivers a complete amino acid profile at comparable protein density. The picks below are vegan-shelf products ranked by cost per 25g of protein, with protein density called out on each card so single-source isolates and multi-source blends can be compared directly.
View all vegan protein powders
Pure Source Nutrition PSN Pea Protein 5kg Powder hits 86% protein density from a multi-source plant blend, putting it in whey territory for amino-acid completeness. £0.24 per 25g of protein. Strong clean-label score.
Bulking is a numbers game: enough calories to gain mass, enough protein to direct them into muscle rather than fat. The picks below lead on kcal per 25g serving so the calorie contribution is explicit, with £/25g of protein paired alongside so a high-kcal serving isn't masking a low-protein blend. Strong picks usually come from the mass-gainer shelf; when supply is thin we backfill with high-density whey above 75% protein.
View all mass gainers
Peak Supps Organic Rice Protein Powder 80% leads on calorie density at 93 kcal per 25g serving, paired with £0.46 per 25g of protein. Bag sizes from 0.5kg to 5kg.
Whey isolate is filtered to 90% protein or higher with minimal fat and lactose, which is what justifies the premium over whey concentrate. The picks below lead with protein density (the metric most readers compare on), with cost per 25g attached so the value calculation stays visible. Worth the premium if you're calorie-conscious, lactose-sensitive, or chasing maximum protein per serving.
View all whey isolates
Non-GMO 80% pea isolate available unflavoured or with stevia/sucralose options, with a Soil Association-certified organic variant under code GB-ORG-05.
We don't taste-test (yet), so we use flavour-variant count as our proxy: wider flavour ranges signal sustained R&D investment and repeat-buy demand, which both correlate with taste reputation in third-party reviews. The picks below lead with flavour count, tiebroken on clean-label score and cost per 25g, restricted to whey, isolate, and clear-whey shelves where taste is the lead purchase driver.
View clear whey protein powders
The UK and Europe's number-one-selling whey concentrate for over 20 years, with 23g protein per serving and 40-plus flavour options.
These podiums show our top three per goal. For the full ranked list across every UK retailer, jump into the comparison tables.