Performance
Casein Protein
Also known as: Micellar casein, Calcium caseinate
Slow-digesting milk protein. Provides sustained amino acid release, ideal before bed.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Casein Protein product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Optimum Nutrition GOLD STANDARD 100% Casein | 90 A | $1.75 |
| 2 | NutraBio Micellar Casein | 84 A- | $1.67 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Casein Protein should I take?
The typical range is 20-40g before bed. As needed
When should I take Casein Protein?
Before bed, between meals. Either.
Which form of Casein Protein is best?
Micellar casein — Slowest release. Other forms in the catalog: Caseinate.
Is Casein Protein safe?
Commonly reported: Same as whey, Thicker texture. Serious warnings: Dairy allergy. Normal protein considerations
Which Casein Protein supplement scores highest?
Optimum Nutrition GOLD STANDARD 100% Casein, at 90/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Primary uses
- Muscle building
- Overnight recovery
- Sustained release
How it works
- Forms gel in stomach
- 7+ hours of amino acid release
- Anti-catabolic overnight
Dosage
- Typical range
- 20-40g before bed
- Timing
- Before bed, between meals
- With food
- Either
- Duration
- As needed
- Special populations
- Overnight muscle preservation
Forms
- Micellar casein
- Caseinate
Safety
Common side effects
- Same as whey
- Thicker texture
Contraindications
- Milk allergy
Products containing Casein Protein
Top-scoring supplements in our catalog that list Casein Protein on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Well-established slow-release protein
Grade A: Multiple well-designed human trials support the main claims.
Casein Protein compared head-to-head
Related in Performance
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.