Casein Protein
Also known as: Micellar casein, Milk protein
Casein is the slower-digesting protein fraction of milk, commonly used to help meet daily protein targets and often taken in the evening because of its gradual release. As with whey, total daily protein matters more than timing details. It is a dairy product, which matters for milk allergy and lactose sensitivity.
Snapshot
What this page can tell you: Commonly discussed timing, food notes, caution categories, and an honest note on how much source review this entry still needs.
What it cannot: Whether this is appropriate for you personally, or that it treats, prevents, or cures any condition. Informational only — discuss with a clinician or pharmacist.
🕒 Timing
When: Evening, Anytime
Food: With or without food
Often taken in the evening for its slow digestion, but total daily protein matters most.
💊 Common use range
20–40 g per serving
Base total protein on overall diet and goals; more per serving is not necessarily better.
Ranges are informational, not a recommended dose. Talk to a professional about what is right for you.
⚠️ Commonly noted interactions (supplements)
None listed.
Often about absorption or timing rather than danger — separating doses is common. This list is not exhaustive.
🧭 Caution level
No major caution categories flagged in our data for this item.
Caution level is an informational summary of commonly discussed caution categories and doses — not a safety rating, approval, or medical advice. Low caution does not mean safe for you.
🩺 Medication caution categories
None flagged here, but always review your full routine with a professional.
🏥 Surgery & procedure caution
Not typically a surgical concern; follow fasting instructions before procedures.
If you have a procedure scheduled, bring your full supplement list to your surgical and anesthesia team. Do not stop prescribed medication unless your clinician tells you to. Do not start or stop supplements based only on this app.
✅ Quality checklist
- Prefer products with third-party testing or a certificate of analysis (COA).
- Check the label for the exact form and the elemental or active amount per serving.
🧩 Commonly paired with
🔁 Alternatives
🗣️ Questions for a professional
- Is there any reason a dairy-based protein powder is a poor fit for me?
🔬 Evidence snapshot
Overall evidence level here is listed as "Moderate evidence". A detailed, source-reviewed evidence summary has not been completed yet.
🧪 Forms & quality
Needs evidence review — no source-reviewed information yet. We only show dose and monitoring details after they have been checked against reputable sources.
See the supplement glossary for what form names like "L-", chelated, or standardized extract mean.
📏 Dose & monitoring
Needs evidence review — no source-reviewed information yet. We only show dose and monitoring details after they have been checked against reputable sources.
Evidence vs. burden: Not yet reviewed
😐 Commonly reported side effects
- Bloating or digestive upset, especially with lactose sensitivity
Non-exhaustive and individual.
🔄 Cycling & breaks
Not cycled; use as needed to meet protein goals.
📅 Daily use notes
Contains dairy; not suitable for milk allergy, and lactose-sensitive people may tolerate it poorly.
📋 Source review status
Source-reviewed — last reviewed 2026-07-03
Reviewed against the NIH ODS exercise/athletic-performance fact sheet (protein adequacy); editorial pass still pending.
Research backlog (queries to verify):
- casein versus whey protein muscle protein synthesis evidence
- pre-sleep casein protein overnight recovery trial
📚 References
- NIH ODS — Dietary Supplements for Exercise and Athletic Performance (Consumer)NIH ODS — Protein-adequacy framing: 'There is no benefit to consuming more than recommended amounts' and athletes 'can probably eat enough foods that contain protein to meet' needs. Casein is a slower-digesting dairy protein used to help meet daily targets; no muscle-building claim.
Verified against the source shown. See the research-status page for how review works.
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