Various · 1kg - 5kg · 2 sizes
18g
95
3g
1g
£0.21per 25g protein
£29.99 for the 5kg·2 retailers·
Animal protein
Cheapest Animal Protein Powder UK
Every dairy protein tracked, ranked by cost per 25g protein. Whey, isolate, casein and mass gainer across 57+ UK retailers, each price shown with its check date.
244 products tracked57+ retailersDated price checks
Back to all proteinQuick filters
CHEAPEST
Whey concentrate1kg - 5kg · 2 sizes
Powdered Mix · 4.4kg
17g
89
2.5g
1g
£0.28per 25g protein
£32.99 bag·2 retailers·
Whey concentrate4.4kg
Various · 1kg - 2.5kg · 2 sizes
18g
95
2.5g
1.3g
£0.32per 25g protein
£22.99 for the 2.5kg·2 retailers·
Whey concentrate1kg - 2.5kg · 2 sizes
Chocolate Mint · 2.25kg - 5kg · 2 sizes
17.5g
90
1.5g
1g
£0.32per 25g protein
£44.99 for the 5kg·1 retailer·
Whey concentrate2.25kg - 5kg · 2 sizes
Strawberry · 1kg - 3kg · 3 sizes
17.5g
95
2.7g
1.8g
£0.36per 25g protein
£9.99 for the 1kg·2 retailers·
Whey concentrate1kg - 3kg · 3 sizes
Chocolate Mint · 5kg
18g
89
1.3g
1g
£0.36per 25g protein
£51.99 bag·1 retailer·
Whey concentrate5kg
Strawberry · 5kg
19g
89
2.5g
0.4g
£0.39per 25g protein
£58.99 bag·1 retailer·
Whey concentrate5kg
Banana · 4kg
20g
93
1g
0.8g
£0.39per 25g protein
£49.99 bag·1 retailer·
CHEAPEST
Casein4kg
Chocolate · 1kg - 5kg · 2 sizes
21.8g
91
0.5g
0.3g
£0.40per 25g protein
£69.99 for the 5kg·3 retailers·
CHEAPEST
Whey isolate1kg - 5kg · 2 sizes
For Muscle Growth · 1kg - 5kg · 3 sizes
21.8g
90
0.5g
0.3g
£0.43per 25g protein
£14.99 for the 1kg·2 retailers·
Whey isolate1kg - 5kg · 3 sizes
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 · 907g - 5kg · 3 sizes
12.8g
96
9.1g
1.2g
£0.44per 25g protein
£44.99 for the 5kg·1 retailer·
Whey concentrate907g - 5kg · 3 sizes
Muscle Building & Muscle Growth · 1kg
17.5g
95
2.5g
1.5g
£0.46per 25g protein
£12.99 bag·1 retailer·
Whey concentrate1kg
Strawberry · 1kg - 5kg · 2 sizes
17.5g
91
4g
0.5g
£0.46per 25g protein
£63.99 for the 5kg·1 retailer·
Whey concentrate1kg - 5kg · 2 sizes
Various · 2.5kg
17.6g
91
4g
0.5g
£0.47per 25g protein
£32.99 bag·1 retailer·
Whey concentrate2.5kg
90+ + Shaker Bottle Chocolate · 2.5kg
22.5g
91
0.5g
0.3g
£0.47per 25g protein
£41.99 bag·2 retailers·
Whey concentrate2.5kg
Various · 500g - 2.5kg · 4 sizes
18g
95
3g
1g
£0.50per 25g protein
£35.99 for the 2.5kg·2 retailers·
Whey concentrate500g - 2.5kg · 4 sizes
Chocolate Orange · 2.25kg - 5kg · 2 sizes
8.3g
105
13.5g
2.2g
£0.53per 25g protein
£34.99 for the 5kg·1 retailer·
Whey concentrate2.25kg - 5kg · 2 sizes
Unflavoured · 500g - 5kg · 4 sizes
23.8g
105
0.3g
0.8g
£0.53per 25g protein
£19.99 for the 1kg·2 retailers·
HIGHEST PROTEIN %
Whey isolate500g - 5kg · 4 sizes
Strawberry · 2.2kg
18g
95
2.5g
1.3g
£0.54per 25g protein
£33.99 bag·1 retailer·
Whey concentrate2.2kg
Various · 1kg
18.8g
97
1.3g
1.7g
£0.57per 25g protein
£16.99 bag·1 retailer·
Whey concentrate1kg
Triple Chocolate Brownie · 500g - 2kg · 2 sizes
23.1g
97
0.6g
0.5g
£0.58per 25g protein
£42.99 for the 2kg·2 retailers·
Whey concentrate500g - 2kg · 2 sizes
Strawberry Cheesecake · 1kg - 2.3kg · 2 sizes
18g
95
2.5g
1.3g
£0.60per 25g protein
£39.99 for the 2.3kg·1 retailer·
Whey concentrate1kg - 2.3kg · 2 sizes
Various · 1kg
17.5g
94
2.5g
1.3g
£0.61per 25g protein
£16.99 bag·3 retailers·
Whey concentrate1kg
Browse All Animal Protein Products (244)
About Animal-Source Protein
Animal-source protein powders - whey and casein - remain the gold standard for muscle building. Whey is fast-absorbing and ideal post-workout, while casein digests slowly and is popular before bed.
This page shows every animal-source protein powder we track across UK retailers. Whey concentrate is the most affordable option with 70-80% protein content. Whey isolate pushes that to 85-92% with less fat and lactose. Casein sits between the two on price but offers a completely different absorption profile.
Every price is ranked by cost per 25g of protein and shown with the date it was checked. Use the filters to compare by brand, bag size or specific protein type.
Shop by goal
Pick a target, see the shortlist.
Brand battles
Two brands, one clear winner.
Myprotein vs Bulk
The UK's two biggest DTC brands, head-to-head
ON vs Myprotein
Premium global vs budget UK favourite
Myprotein vs Protein Works
Impact Whey vs Whey 80, cheapest per 25g
Power users
Advanced comparison: every product, filteredDense table view with every product, full filter sidebar, and no editorial surfaces.
Methodology
How we rank every bag.
Independent and transparent, with every price shown alongside the date it was checked. Here's what goes into each score.
01
Cost normalised to £/25g
Every bag divided by its true protein weight, so you see the real cost of a scoop across any size or brand.
02
Protein density, measured
Protein per 100g from the product's own nutrition panel, so a 90% isolate and a 72% concentrate are never compared on bag price alone.
03
Every price carries its date
Prices come from the retailer's own listing, never an RRP, and each one is shown with the day it was last checked so you can judge how current it is.
04
No sponsored placements
Rank order is cost per 25g of protein. Some outbound links earn commission; none of them buy a position in the table.
Questions, answered.
Whey concentrate typically contains 70-80% protein with some fat and lactose. Whey isolate goes through additional filtering to reach 85-92% protein with minimal fat and lactose. Isolate is better for lactose-intolerant users but costs more per gram of protein.
Both support muscle building effectively. Whey is fast-absorbing and ideal post-workout, while casein's slow digestion makes it popular before bed. Many athletes use both at different times of day.
Whey has a slight edge for muscle protein synthesis due to its complete amino acid profile and faster absorption. However, blended plant proteins with comparable amino acid profiles come very close in effectiveness.
244 results