Prices and ratings below were checked on Amazon UK on 21 October 2026 and are refreshed regularly. Amazon prices change daily — the live price is always the one on Amazon. As an Amazon Associate we earn from qualifying purchases; it never changes the order of this table.
Micellar casein digests more slowly than whey, which is why people take it before bed. Compared on price per kg; it usually costs a little more than whey per gram of protein.
Casein Protein UK — all 4 products
Prices checked on Amazon UK: 21 October 2026. Prices change daily — the live price is shown on Amazon.
| # | Product | Price | Price per kg | Rating | |
|---|---|---|---|---|---|
| 1 | Optimum Nutrition Gold Standard Casein Slow Digesting Protein Powder…28 Servings | £45.99 | £49.77/kg | ★★★★☆ (9,041) | Amazon → |
| 2 | PBN1kg | £28.04 | £28.04/kg | ★★★★☆ (1,136) | Amazon → |
| 3 | Bulk Micellar Casein Protein Powder500 g | £15.99 | £31.98/kg | ★★★★☆ (762) | Amazon → |
| 4 | Applied Nutrition Casein Protein Powder1.8kg | £44.95 | £24.97/kg | ★★★★☆ (94) | Amazon → |
Optimum Nutrition Gold Standard Casein Slow Digesting Protein Powder…
28 Servings
£45.99 £49.77/kg price per kg
- SLOW-DIGESTING PROTEIN powder FORTIFIED with zinc which contributes to a healthy immune system and magnesium …
- The ready-to-mix powder provides a source of slow digesting protein to support muscle growth and repair*
- Each serving contains 24 g of premium micellar casein protein that provides your body with a slow and steady …
PBN
1kg
£28.04 £28.04/kg price per kg
- Protein contributes to growth in muscle mass(1)and to the maintenance of normal bones.(2)
- Good product with excellent quality
- 33 servings per pack.
Bulk Micellar Casein Protein Powder
500 g
£15.99 £31.98/kg price per kg
- Packaging May Vary
- A premium source of micellar casein in potent powder form
- Powered by at least 25 g protein per serving
Applied Nutrition Casein Protein Powder
1.8kg
£44.95 £24.97/kg price per kg
- SLOW-RELEASE NIGHT-TIME PROTEIN: Fuel muscle recovery while you sleep with 100% micellar casein, delivering a…
- HIGH PROTEIN, LOW CARB FORMULA: Each serving provides 25.2g of pure protein, just 105 calories, 1.1g carbs, a…
- ENHANCED WITH BCAAs & DIGESTIVE ENZYMES: Fortified with 5.4g BCAAs per serving, supporting muscle repair, end…
How to use this table
Ratings are the real Amazon UK owner ratings at the time of checking and the price per kg column is the fairest way to compare value across tub sizes. Click any product to see the live price, current offers and the full reviews on Amazon.
Related reviews and guides
- Applied Nutrition Micellar Casein Review UK (2026): Cheaper Than Most Whey?
- Whey Protein vs Casein: Which Should You Buy? (2026)
- How Much Protein Do You Actually Need Per Day? (No BS Answer)
Last checked: October 2026.