Hydroxypropyl Chitosan

What is Hydroxypropyl Chitosan?

Hydroxypropyl chitosan is a semi-synthetic polysaccharide derived from chitin, a natural polymer extracted primarily from crustacean shells. Chemical modification with hydroxypropyl groups enhances its solubility in water, enabling use in aqueous cosmetic formulations. Commonly incorporated into skincare creams, lotions, sunscreens, shampoos, and makeup, it functions by depositing a flexible, invisible film on skin or hair surfaces. This film boosts product adhesion, offering resistance to water, sweat, or friction while allowing breathability. Simultaneously, it modulates formulation thickness, promoting even distribution, stability, and pleasant sensory feel during application. Its biocompatibility supports diverse product types seeking improved performance without heaviness.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Film former
Creates a continuous film on skin or hair to improve wear, water resistance, transfer resistance, shine, or hold in sunscreens, makeup, and styling products.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Creates a flexible film that enhances product staying power and water resistance.

Improves formulation texture for smoother application and better stability.

Supports non-comedogenic properties, suitable for acne-prone skin.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Users of long-wear sunscreens or makeup for extended protection.
Those with known shellfish allergies due to chitin origin.
Individuals preferring stable, easy-to-apply creams and lotions.
Individuals sensitive to polysaccharide derivatives, pending patch testing.
People with normal to oily skin seeking lightweight film-forming benefits.
Vegans preferring strictly plant-based ingredients, if shellfish-sourced.

Safety Notes

  • Assessed as low hazard for cosmetic use by safety panels.
  • Minimal comedogenic potential, rated zero on standard scales.

Frequently Asked Questions about Hydroxypropyl Chitosan

What is hydroxypropyl chitosan made from?

It's a modified form of chitin from crustacean shells, made water-soluble via hydroxypropylation.

Is hydroxypropyl chitosan safe for daily use?

Yes, it's considered safe for cosmetic topical use with low hazard ratings.

What products typically include it?

Common in sunscreens, moisturizers, shampoos, and makeup for film and texture benefits.