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Chitosan (Supplement)

Last updated on July 30, 2019.

Overview   |   Dosage   |   Side Effects   |   Where To Buy  

GENERIC NAME: Chitosan / Chitin



What is Chitosan for?

Chitosan is a polysaccharide derived from chitin. It has been suggested that chitosan binds dietary fat in your intestines. When ingested, like other fibers, Chitosan will swell in the stomach and intestines which gives a sense of fullness and may reduce your appetite. Hence, Chitosan is commonly used as a supplement for weight management as well as for reducing cholesterol levels. However, there is limited scientific evidence showing that Chitosan is effective.

How to use it?

Chitosan supplements are available in oral dosage forms like tablets and capsules. You should take Chitosan supplements with meals. The usual doses are 3-4.8 g daily in divided doses. For specific dosages, refer to the product label.

What are the side effects of Chitosan?

The side effects of taking Chitosan supplement are mainly constipation, stomach pain, flatulence, heartburn, and malabsorption of fat-soluble vitamins (e.g. Vitamin A, Vitamin D, Vitamin E and K). You should avoid taking Chitosan if you are allergic to seafood since it is produced from the shells of sea crustaceans.

Where to buy Chitosan in Hong Kong?

In Hong Kong, Chitosan supplements can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

For detailed information about the use of Chitosan in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.