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The 10 Best Casein Protein Powder as of July 2026

Updated July 2, 2026 ยท Reviewed by the Pickarank team ยท Prices in GBP, subject to change

We compared the best casein protein powder you can buy in 2026, scoring each out of 10 on performance, value, build quality and features. Here are the ten worth your money โ€” with an at-a-glance table and the current best prices.

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Our top picks at a glance

Top pick

Optimum Nutrition Gold Standard 100% Casein

9.0Best overall
Check price on Amazon โ‰ˆ $45 / 1.8kg
Best value

Bulk Micellar Casein

8.8Best value
Check price on Amazon โ‰ˆ $28 / 1kg
Also great

Applied Nutrition Critical Micellar Casein

8.5Best for taste
Check price on Amazon โ‰ˆ $34 / 1.8kg

Prices were correct at the time of writing and change often โ€” tap through for today's price on Amazon.

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How we ranked these casein protein powder

Each pick earns a score out of 10 from weighted criteria:

  • Performance (35%) โ€” how well each casein protein does its core job.
  • Value (25%) โ€” quality and features for the price.
  • Build & reliability (20%) โ€” materials, longevity and warranty.
  • Features (20%) โ€” meaningful extras that improve the experience.

We also weigh real-world owner reviews โ€” star ratings and how many people left them โ€” and whether each product has the features you'd expect in its class.

At a glance: top 10 compared

Swipe across to see all columns, including Amazon links โ†’

#Casein Protein PowderScoreBest forProtein/servingApprox. PriceAmazon links
1Optimum Nutrition Gold Standard 100% Casein9.0Best overall~24g$45 / 1.8kgView Price
2Bulk Micellar Casein8.8Best value~24g$28 / 1kgView Price
3MyProtein Slow-Release Casein8.7Best budget brand~22g$26 / 1kgView Price
4The Protein Works Micellar Casein8.5Best flavor range~23g$30 / 1kgView Price
5Applied Nutrition Critical Micellar Casein8.5Best for taste~24g$34 / 1.8kgView Price
6Reflex Micellar Casein8.4Best quality~23g$36 / 909gView Price
7GoNutrition Micellar Casein8.4Best clean-label~23g$29 / 1kgView Price
8Nutristrength Micellar Casein8.3Best simple~22g$28 / 1kgView Price
9SCI-MX Casein8.3Best budget tubs~22g$30 / 1.8kgView Price
10Amazon own-brand Casein8.2Best ultra-budget~22g$26 / 1kgView Price

The full ranking

1
Best overall

Optimum Nutrition Gold Standard 100% Casein

9.0Our number one pick.

ON Gold Standard 100% Casein provides around 24g of slow-digesting micellar casein per serving, releasing amino acids gradually and often taken before bed. It is thicker to mix, but the quality, taste and slow-release profile are excellent.

Protein: 9.0Mixability: 8.6Taste: 9.0Value: 8.6
Pros
  • Quality micellar casein
  • Great taste
  • Slow-release profile
Cons
  • Thick texture
  • Pricier than concentrate
Check price on Amazonโ‰ˆ $45 / 1.8kg
2
Best value

Bulk Micellar Casein

8.8A superb runner-up.

Bulk Micellar Casein offers around 24g of slow-digesting protein per serving at a keen price with several flavors. It is thick, but the value and profile are excellent.

Protein: 9.0Mixability: 8.4Taste: 8.6Value: 9.2
Pros
  • Great value
  • Slow-release protein
  • Several flavors
Cons
  • Thick to mix
  • Flavors vary
Check price on Amazonโ‰ˆ $28 / 1kg
3
Best budget brand

MyProtein Slow-Release Casein

8.7Rounds out our top three.

MyProtein Slow-Release Casein provides around 22g of micellar casein per serving with flavor options at a low price. Texture is thick, but the value and profile are excellent.

Protein: 8.8Mixability: 8.4Taste: 8.6Value: 9.2
Pros
  • Affordable
  • Slow-release
  • Flavoured options
Cons
  • Thick texture
  • Basic flavors
Check price on Amazonโ‰ˆ $26 / 1kg
4
Best flavor range

The Protein Works Micellar Casein

8.5A standout in the upper half.

TPW Micellar Casein pairs around 23g of slow-release protein with a wide flavor selection at a fair price. Some flavors are better than others, but the range and profile are excellent.

Protein: 8.8Mixability: 8.4Taste: 8.6Value: 8.8
Pros
  • Wide flavor choice
  • Slow-release
  • Good value
Cons
  • Thick texture
  • Flavor quality varies
Check price on Amazonโ‰ˆ $30 / 1kg
5
Best for taste

Applied Nutrition Critical Micellar Casein

8.5A well-rounded mid-table pick.

Applied Nutrition Critical Casein brings the brand's dessert-like flavors to around 24g of slow-release protein per serving. It is sweet and pricier, but the taste and profile are excellent.

Protein: 8.8Mixability: 8.6Taste: 9.0Value: 8.4
Pros
  • Great flavors
  • Slow-release
  • Smooth for a casein
Cons
  • Sweet
  • Higher price
Check price on Amazonโ‰ˆ $34 / 1.8kg
6
Best quality

Reflex Micellar Casein

8.4Great value in the middle of the pack.

Reflex Micellar Casein provides around 23g of high-quality slow-release protein with careful processing from a trusted brand. It is pricier with fewer flavors, but the quality is good.

Protein: 8.8Mixability: 8.2Taste: 8.2Value: 8.2
Pros
  • High-quality casein
  • Clean profile
  • Trusted brand
Cons
  • Higher price
  • Fewer flavors
Check price on Amazonโ‰ˆ $36 / 909g
7
Best clean-label

GoNutrition Micellar Casein

8.4A dependable pick if the price is right.

GoNutrition Micellar Casein offers around 23g of slow-release protein with clean labeling and unflavoured options. Fewer flavors, but the value and profile are good.

Protein: 8.8Mixability: 8.2Taste: 8.2Value: 8.8
Pros
  • Clean labeling
  • Unflavoured option
  • Slow-release
Cons
  • Thick texture
  • Fewer flavors
Check price on Amazonโ‰ˆ $29 / 1kg
8
Best simple

Nutristrength Micellar Casein

8.3Solid, if outshone by pricier rivals.

Nutristrength Micellar Casein keeps things simple with around 22g of slow-release protein per serving at a fair price. It is basic, but for straightforward casein the value is good.

Protein: 8.6Mixability: 8.2Taste: 8.0Value: 8.8
Pros
  • Simple and affordable
  • Slow-release
  • Decent protein
Cons
  • Thick texture
  • Plain flavors
Check price on Amazonโ‰ˆ $28 / 1kg
9
Best budget tubs

SCI-MX Casein

8.3A budget-friendly option worth a look.

SCI-MX Casein provides around 22g of slow-release protein in big value tubs for everyday overnight shakes. Flavors are basic, but the value is good.

Protein: 8.6Mixability: 8.2Taste: 8.2Value: 9.0
Pros
  • Big value tubs
  • Slow-release
  • Affordable
Cons
  • Basic flavors
  • Thick
Check price on Amazonโ‰ˆ $30 / 1.8kg
10
Best ultra-budget

Amazon own-brand Casein

8.2Rounds out our top ten.

An Amazon own-brand micellar casein covers the basics of slow-release protein with around 22g per serving at a low price. It is basic, but for the money it does the job.

Protein: 8.6Mixability: 8.0Taste: 8.0Value: 9.0
Pros
  • Cheap slow-release protein
  • Decent protein
  • Widely available
Cons
  • Thick texture
  • Plain taste
Check price on Amazonโ‰ˆ $26 / 1kg

Frequently asked questions

What's the best of the casein protein powder in 2026?

Our top overall pick is the Optimum Nutrition Gold Standard 100% Casein, which leads on our combined score for performance, value and features. The Bulk Micellar Casein and MyProtein Slow-Release Casein are excellent alternatives depending on budget and needs.

How did we choose these?

We weight performance, value, build quality and features, drawing on hands-on use and independent testing. See the methodology box above for the full breakdown.

Are these prices accurate?

Prices are approximate UK figures at the time of writing and change frequently. Click through to Amazon for the current price.

The bottom line

If you just want the best casein protein powder without overthinking it, the Optimum Nutrition Gold Standard 100% Casein is our top recommendation โ€” it earns the highest overall score for performance, value and features. Have a look at the current price and see what you think.

Check price on Amazon โ‰ˆ $45 / 1.8kg

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