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Casein protein

Also called protein, whey, whey protein and 13 more

casein, micellar casein, beef protein, egg protein, egg white protein, soy protein, pea protein, rice protein, hemp protein, vegan protein, plant protein, protein isolate, protein concentrate.

The best price per 25 g protein and per month across 3 UK retailers, and where to buy it cheapest. A unit for comparing, not advice.

Comparing protein powder

We count the protein a label states per serving, whatever the pack size or the serving size, so every product sits on one scale. Protein powder comes as whey concentrate, whey isolate, whey hydrolysate, whey blend, milk protein, casein, beef protein, egg white protein, soy protein, pea protein, rice protein and vegan protein blend, and each form has its own table, because someone buying one would not usually take another as a like-for-like substitute. Products that combine protein powder with other ingredients are listed separately, because their price buys more than protein. 25 g is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

Prices last checked: 20 October 2026. Ranked purely by price per 25 g protein — a comparison unit, not a recommendation. We earn commission when you buy through these links; it never affects the order.

Protein powder, Casein: products ranked by price per 25 g protein
Rank	Product	Per 25 g protein	Per month	Lasts	Buy	How it is worked out
1	Cheapest per doseImpact Micellar Casein Powder - Hokkaido Milk1 kg · 33.3 servings · 24 g a servingDetails and price history Add to my stackHokkaido Milkclaimed: vegetarian	91p	£27.18	32 days	£28.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 1000 ÷ 30 per serving = 33.3 In the pack: 33.3 × 24 g = 800 g £28.99 ÷ 800 g × 25 g = 90.6p per 25 g Amount per serving: stated on the label. What the retailer's listing says pack units “1kg” units per serving “Mix 30g” amount per serving “Protein ; 80g ; 24g” Is this wrong? Tell us
2	Impact Micellar Casein Powder - Chocolate2.7 kg · 90 servings · 24 g a servingDetails and price history Add to my stackChocolateclaimed: vegetarian	93p	£27.77	3 months	£79.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 2700 ÷ 30 per serving = 90 In the pack: 90 × 24 g = 2,160 g £79.99 ÷ 2,160 g × 25 g = 92.6p per 25 g Amount per serving: stated on the label. What the retailer's listing says pack units “2700g” servings stated “90servings” units per serving “Per 30g Serving” amount per serving “Protein ; 79g ; 24g” Is this wrong? Tell us
3	Impact Micellar Casein Powder - Strawberry2.7 kg · 90 servings · 24 g a servingDetails and price history Add to my stackStrawberryclaimed: vegetarian	93p	£27.77	3 months	£79.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 2700 ÷ 30 per serving = 90 In the pack: 90 × 24 g = 2,160 g £79.99 ÷ 2,160 g × 25 g = 92.6p per 25 g Amount per serving: stated on the label. What the retailer's listing says pack units “2700g” servings stated “90servings” units per serving “Per 30g Serving” amount per serving “Protein ; 80g ; 24g” Is this wrong? Tell us
4	Impact Micellar Casein Powder - Unflavoured2.7 kg · 90 servings · 24 g a servingDetails and price history Add to my stackUnflavouredclaimed: vegetarian	93p	£27.77	3 months	£79.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 2700 ÷ 30 per serving = 90 In the pack: 90 × 24 g = 2,160 g £79.99 ÷ 2,160 g × 25 g = 92.6p per 25 g Amount per serving: stated on the label. What the retailer's listing says pack units “2700g” servings stated “90servings” units per serving “Per 30g Serving” amount per serving “Protein ; 82g ; 24g” Is this wrong? Tell us
5	Impact Micellar Casein Powder - Vanilla2.7 kg · 90 servings · 23 g a servingDetails and price history Add to my stackVanillaclaimed: vegetarian	97p	£28.98	3 months	£79.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 2700 ÷ 30 per serving = 90 In the pack: 90 × 23 g = 2,070 g £79.99 ÷ 2,070 g × 25 g = 96.6p per 25 g Amount per serving: stated on the label. What the retailer's listing says pack units “2700g” servings stated “90servings” units per serving “Per 30g Serving” amount per serving “Protein ; 77g ; 23g” Is this wrong? Tell us
6	Impact Micellar Casein Powder - Iced Latte2.7 kg · 90 servings · 23 g a servingDetails and price history Add to my stackIced Lattealso contains caffeine, caffeineclaimed: vegetarian	97p	£28.98	3 months	£79.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 2700 ÷ 30 per serving = 90 In the pack: 90 × 23 g = 2,070 g £79.99 ÷ 2,070 g × 25 g = 96.6p per 25 g Amount per serving: stated on the label. Also contains: caffeine, caffeine. The price counts the protein powder only. What the retailer's listing says pack units “2700g” servings stated “90servings” units per serving “Per 30g” amount per serving “Protein ; 77g ; 23g” Is this wrong? Tell us
7	Impact Micellar Casein Powder - Chocolate900 g · 30 servings · 24 g a servingDetails and price history Add to my stackChocolateclaimed: vegetarian	£1.01	£30.20	29 days	£28.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 900 ÷ 30 per serving = 30 In the pack: 30 × 24 g = 720 g £28.99 ÷ 720 g × 25 g = £1.01 per 25 g Amount per serving: stated on the label. What the retailer's listing says pack units “900G” servings stated “30servings” units per serving “Per 30g Serving” amount per serving “Protein ; 79g ; 24g” Is this wrong? Tell us
8	Impact Micellar Casein Powder - Strawberry900 g · 30 servings · 24 g a servingDetails and price history Add to my stackStrawberryclaimed: vegetarian	£1.01	£30.20	29 days	£28.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 900 ÷ 30 per serving = 30 In the pack: 30 × 24 g = 720 g £28.99 ÷ 720 g × 25 g = £1.01 per 25 g Amount per serving: stated on the label. What the retailer's listing says pack units “900G” servings stated “30servings” units per serving “Per 30g Serving” amount per serving “Protein ; 80g ; 24g” Is this wrong? Tell us
9	Impact Micellar Casein Powder - Unflavoured900 g · 30 servings · 24 g a servingDetails and price history Add to my stackUnflavouredclaimed: vegetarian	£1.01	£30.20	29 days	£28.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 900 ÷ 30 per serving = 30 In the pack: 30 × 24 g = 720 g £28.99 ÷ 720 g × 25 g = £1.01 per 25 g Amount per serving: stated on the label. What the retailer's listing says pack units “900G” servings stated “30servings” units per serving “Per 30g Serving” amount per serving “Protein ; 82g ; 24g” Is this wrong? Tell us
10	Impact Micellar Casein Powder - Iced Latte900 g · 30 servings · 23 g a servingDetails and price history Add to my stackIced Lattealso contains caffeine, caffeineclaimed: vegetarian	£1.05	£31.51	28 days	£28.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 900 ÷ 30 per serving = 30 In the pack: 30 × 23 g = 690 g £28.99 ÷ 690 g × 25 g = £1.05 per 25 g Amount per serving: stated on the label. Also contains: caffeine, caffeine. The price counts the protein powder only. What the retailer's listing says pack units “900G” servings stated “30servings” units per serving “Per 30g” amount per serving “Protein ; 77g ; 23g” Is this wrong? Tell us
11	Impact Micellar Casein Powder - Vanilla900 g · 30 servings · 23 g a servingDetails and price history Add to my stackVanillaclaimed: vegetarian	£1.05	£31.51	28 days	£28.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 900 ÷ 30 per serving = 30 In the pack: 30 × 23 g = 690 g £28.99 ÷ 690 g × 25 g = £1.05 per 25 g Amount per serving: stated on the label. What the retailer's listing says pack units “900G” servings stated “30servings” units per serving “Per 30g Serving” amount per serving “Protein ; 77g ; 23g” Is this wrong? Tell us
12	Gold Standard 100% Casein Protein Powder 1.82 kg (55 servings) Chocolate SupremeOptimum Nutrition · 1.82 kg · 55.2 servings · 24 g a servingDetails and price history Add to my stackChocolate Supreme	£1.42	£42.50	53 days	£75.00View at Optimum Nutrition (opens in a new tab)Free delivery over £50.00, otherwise £3.99 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 1820 ÷ 33 per serving = 55.2 In the pack: 55.2 × 24 g = 1,323.6 g £75.00 ÷ 1,323.6 g × 25 g = £1.42 per 25 g Amount per serving: stated on the label. What the retailer's listing says flavour “Chocolate Supreme” pack units “1.82 kg” servings stated “(55 servings)” units per serving “33 g” amount per serving “Protein ; 74 g ; 24 g” Is this wrong? Tell us
13	Gold Standard 100% Casein Protein Powder 924 g (28 servings) Chocolate SupremeOptimum Nutrition · 924 g · 28 servings · 24 g a servingDetails and price history Add to my stackChocolate Supreme	£1.67	£50.22	27 days	£45.00View at Optimum Nutrition (opens in a new tab)Free delivery over £50.00, otherwise £3.99 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 924 ÷ 33 per serving = 28 In the pack: 28 × 24 g = 672 g £45.00 ÷ 672 g × 25 g = £1.67 per 25 g Amount per serving: stated on the label. What the retailer's listing says flavour “Chocolate Supreme” pack units “924 g” servings stated “(28 servings)” units per serving “33 g” amount per serving “Protein ; 74 g ; 24 g” Is this wrong? Tell us
14	Gold Standard 100% Casein Protein Powder 924 g (28 servings) Creamy VanillaOptimum Nutrition · 924 g · 28 servings · 24 g a servingDetails and price history Add to my stackCreamy Vanilla	£1.67	£50.22	27 days	£45.00View at Optimum Nutrition (opens in a new tab)Free delivery over £50.00, otherwise £3.99 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 924 ÷ 33 per serving = 28 In the pack: 28 × 24 g = 672 g £45.00 ÷ 672 g × 25 g = £1.67 per 25 g Amount per serving: stated on the label. What the retailer's listing says flavour “Creamy Vanilla” pack units “924 g” servings stated “(28 servings)” units per serving “33 g” amount per serving “Protein ; 74 g ; 24 g” Is this wrong? Tell us
15	Gold Standard 100% Casein Protein Powder 924 g (28 servings) Cookies & CreamOptimum Nutrition · 924 g · 28 servings · 24 g a servingDetails and price history Add to my stackCookies & Cream	£1.67	£50.22	27 days	£45.00View at Optimum Nutrition (opens in a new tab)Free delivery over £50.00, otherwise £3.99 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 924 ÷ 33 per serving = 28 In the pack: 28 × 24 g = 672 g £45.00 ÷ 672 g × 25 g = £1.67 per 25 g Amount per serving: stated on the label. What the retailer's listing says flavour “Cookies & Cream” pack units “924 g” servings stated “(28 servings)” units per serving “33 g” amount per serving “Protein ; 74 g ; 24 g” Is this wrong? Tell us
16	Gold Standard 100% Casein Protein Powder 924 g (28 servings) Strawberry DelightOptimum Nutrition · 924 g · 28 servings · 24 g a servingDetails and price history Add to my stackStrawberry Delight	£1.67	£50.22	27 days	£45.00View at Optimum Nutrition (opens in a new tab)Free delivery over £50.00, otherwise £3.99 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 924 ÷ 33 per serving = 28 In the pack: 28 × 24 g = 672 g £45.00 ÷ 672 g × 25 g = £1.67 per 25 g Amount per serving: stated on the label. What the retailer's listing says flavour “Strawberry Delight” pack units “924 g” servings stated “(28 servings)” units per serving “33 g” amount per serving “Protein ; 74 g ; 24 g” Is this wrong? Tell us
17	Transparent LabsGrass Fed Casein Protein - Chocolate · 30 servings · 25 g a servingDetails and price history Add to my stackChocolate	£2.13	£63.99	30 days	£63.99View at Healf (opens in a new tab)Free delivery over £50.00, otherwise £3.99 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 30 (as stated on the label) In the pack: 30 × 25 g = 750 g £63.99 ÷ 750 g × 25 g = £2.13 per 25 g Amount per serving: stated on the label. What the retailer's listing says servings stated “Servings Per Container: 30” units per serving “Serving Size: 1 Scoop (35g)” amount per serving “Protein ; 25 g” Is this wrong? Tell us