Polysilicone-29
INCI: POLYSILICONE-29
Reviewed by Rosie · Last updated 2 Jun 2026
A silicone-based conditioning agent primarily used in hair and scalp formulations
At a glance
Best For Skin Types
All, Oily, Dry, Combination, Sensitive, Mature, Acne-prone
Usage Frequency
Daily
What Is Polysilicone-29?
Polysilicone-29 is a synthetic silicone polymer derived from silicon. It functions as a conditioning and film-forming agent, most commonly found in hair care products rather than skincare. When used in skincare formulations, it works by creating a lightweight, breathable film on the skin surface.
This ingredient is relatively uncommon in skincare products, appearing in fewer than 0.1% of formulations on the market. Its primary role is cosmetic rather than therapeutic—it is designed to improve texture and feel rather than to deliver active skincare benefits.
How It Works
Polysilicone-29 works by depositing a thin, flexible film across the skin's surface. This film is permeable, meaning it allows the skin to breathe whilst providing a temporary smoothing effect and helping to seal in hydration.
Unlike heavier silicones, polysilicone-29 is designed to feel lightweight and non-occlusive, making it suitable for products where a natural finish is desired.
Clinical Evidence & References
Research specific to polysilicone-29 in skincare is limited. The ingredient has been used safely in cosmetic formulations for decades, and silicones in general have a long history of use in skincare without significant safety concerns reported in the literature.
However, there is no substantial clinical evidence demonstrating that polysilicone-29 delivers measurable improvements to skin barrier function, hydration, or other skin health markers. Its benefits are primarily sensory and cosmetic in nature.
How to Use
Polysilicone-29 is typically used as a component within a broader skincare formulation rather than as a standalone product. It is most effective when combined with other active or hydrating ingredients. Use as directed by the specific product formulation.
Safety & Precautions
How widely it's used
Regulatory information
Standardised cosmetic-ingredient identifiers used by regulators.
Show identifiers
- INCI Name
- POLYSILICONE-29
- Function
- Hair Conditioning
Frequently Asked Questions
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