10 Best Casein Protein Powders of 2026
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Casein is the slow-digesting milk protein. Many lifters take it before bed or between meals. Protein supports the growth and maintenance of muscle. Casein contains milk; skip it if you have a milk allergy.
Klean Athlete Klean Casein
Klean Athlete
Micellar casein with NSF sport certification.
- 24 g protein per scoop
- Micellar casein
Optimum Nutrition Gold Standard 100% Casein
Optimum Nutrition
The best-known casein, with many flavors.
- 24 g protein per scoop
- Micellar casein
Dymatize Elite Casein
Dymatize
Micellar casein known for pudding-like thickness.
- 25 g protein per scoop
- Micellar casein
BulkSupplements Casein Powder
BulkSupplements
Plain casein with an NSF Certified for Sport listing.
- 25 g protein per ~30 g
- Unflavored
NOW Sports Micellar Casein
NOW Foods
Unflavored micellar casein with Informed Sport certification.
- 19 g protein per serving
- Unflavored
Naked Casein
Naked Nutrition
Micellar casein and nothing else.
- Micellar casein only
- Unflavored
Myprotein Slow-Release Casein
Myprotein
Low cost per serving with many flavors.
- Micellar casein
- Flavored
Promix Micellar Casein
Promix
Grass-fed micellar casein.
- Micellar casein
- Grass-fed
Kaged Casein
Kaged
Micellar casein from a performance brand.
- Micellar casein
- Flavored
Legion Casein+
Legion
Naturally sweetened micellar casein.
- Micellar casein
- Natural sweeteners
How we ranked casein protein
Ranked on third-party certification, micellar casein content, protein per serving, mixability and taste reviews, and value.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Talk to your doctor or pharmacist before starting any supplement, especially if you take medication, are pregnant or nursing, or have a medical condition. See our Medical Disclaimer.