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← All supplements
OtherModerate evidence

Chitosan

Also known as: chitosan fibre

Chitosan is a fibre obtained mostly from crustacean shells (or from fungi) that binds part of dietary fat in the gut. EFSA approved a claim that chitosan contributes to the maintenance of normal blood cholesterol at an intake of 3 g per day; its effect on weight loss is small.

What it is used for

  • maintenance of normal blood cholesterol – moderate evidence, EFSA-approved claim (3 g daily)
  • weight loss support – weak evidence, the effect is small and of little clinical relevance

Forms and how they differ

crustacean chitosan

most common; unsuitable if allergic to seafood

fungal chitosan

suitable for vegetarians and people with shellfish allergy

combinations with chromium

chromium has its own claim for blood sugar, not weight loss

When to take it

Shortly before or with a fattier meal, with plenty of water.

Pairs well with

A diet lower in saturated fat, other fibre and physical activity.

Do not combine / separate

Keep at least 2–4 hours between chitosan and medicines, fat-soluble vitamins (A, D, E, K) and omega-3.

Watch out for

Do not use if allergic to shellfish (unless fungal chitosan), or during pregnancy and breastfeeding. If you take warfarin or other medicines, or have kidney or liver disease, consult your doctor.

Safety

Do not exceed the label dose; it can cause constipation and bloating, and long-term use may reduce absorption of fat-soluble vitamins.

Practical tip

For cholesterol support, follow 3 g daily split across meals – the smaller doses in typical capsules do not match the EFSA claim.

Products containing Chitosan 1

Chitosan + Chromium 500 mgchitosan · 500 mg / capsuleHeart & vesselsWeight & satietyBlood sugar & metabolism
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence

Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.

Combination check

Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.

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From the same group

AlfalfaNo evidenceAndrographisWeak evidenceAroniaWeak evidenceBarley grassWeak evidenceBee pollenWeak evidenceBeef organs (desiccated)Weak evidence
Important notice

This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.