Cocodimonium Hydroxypropyl Hydrolyzed Keratin
INCI: COCODIMONIUM HYDROXYPROPYL HYDROLYZED KERATIN
Reviewed by Kate · Last updated 2 Jun 2026
A keratin-derived conditioning agent that helps smooth and protect the skin barrier
Best For Skin Types
Dry, Mature, All
Addresses
Usage Frequency
Daily
What Is Cocodimonium Hydroxypropyl Hydrolyzed Keratin?
Cocodimonium hydroxypropyl hydrolyzed keratin is a modified form of keratin—a structural protein found in hair and skin—that has been broken down (hydrolyzed) and combined with coconut-derived compounds. This processing makes it smaller and more able to penetrate the outer layers of skin, where it can deposit and remain on the surface.
In skincare formulations, it primarily functions as a conditioning and skin-smoothing agent. It also has antistatic properties, which help reduce friction and improve the feel of products on skin.
How It Works
When applied topically, hydrolyzed keratin particles adhere to the skin's surface and form a thin, breathable film. This film helps to seal in moisture and smooth the appearance of the outer layer of skin.
The coconut-derived cationic (positively charged) component allows the keratin to bind more effectively to skin, which is naturally negatively charged. This electrostatic attraction helps the ingredient stay in place rather than wash off immediately.
Clinical Evidence & References
Keratin hydrolysates have a long history of use in personal care products, and there is general agreement in cosmetic science that they function effectively as conditioning agents. However, specific clinical studies on cocodimonium hydroxypropyl hydrolyzed keratin in skincare are limited.
One notable consideration: protein hydrolysates, including keratin derivatives, have been documented in rare cases as potential contact allergens, particularly in individuals with atopic dermatitis or those with occupational exposure (such as hairdressers). While this ingredient is found in relatively few skincare products and allergic reactions remain uncommon, those with a history of atopic dermatitis or protein sensitivity should patch-test first.
Published Research
How to Use
This ingredient is typically used in rinse-off products or leave-on formulations designed to build conditioning benefits over time. For best results, use consistently as part of your routine rather than as an occasional treatment. If using in a serum or moisturiser, apply to clean skin before heavier creams to allow even distribution.
Safety & Precautions
Frequently Asked Questions
From the Clinic
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