Chitosan
Also known as: Deacetylated chitin
Chitosan is a fiber-like polymer made from chitin, which comes from the shells of shellfish such as shrimp and crab. It is discussed for its ability to bind dietary fat in the digestive tract, though human evidence for meaningful outcomes is limited. Because it is shellfish-derived, people with shellfish allergies should be especially cautious and speak with a professional.
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: With a meal
Food: With food
Commonly taken with meals, since it acts on fats during digestion.
💊 Common use range
1,000–3,000 mg
Doses vary; higher intakes increase digestive upset — verify and follow product guidance.
Ranges are informational, not a recommended dose. Talk to a professional about what is right for you.
⚠️ Commonly noted interactions (supplements)
Often about absorption or timing rather than danger — separating doses is common. This list is not exhaustive.
🧭 Caution level
- Absorption / spacing considerations
- Evidence not fully source-reviewed yet
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 a well-established surgical concern; share your full supplement list with your care team.
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
- I have a shellfish allergy — is chitosan safe for me to consider at all?
🔬 Evidence snapshot
Overall evidence level here is listed as "Limited 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
- Digestive upset
- Constipation
- Allergic reactions in people sensitive to shellfish
Non-exhaustive and individual.
🔄 Cycling & breaks
No established cycling pattern.
📅 Daily use notes
Because it binds fats, it may reduce absorption of fat-soluble supplements; space it away from products like fish oil or fat-soluble vitamins. People with shellfish allergies should be cautious.
📋 Source review status
Needs evidence review
Placeholder — verify with MedlinePlus and recent chitosan reviews before publishing; confirm the shellfish-allergy note.
Research backlog (queries to verify):
- chitosan fat binding weight human trial evidence
- chitosan shellfish allergy caution
- chitosan fat-soluble vitamin absorption
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