Science
Mechanism of Action
HPMC functions on the skin primarily through its advanced hygroscopic properties and film-forming capabilities. It establishes a protective, non-occlusive barrier on the skin's surface, which actively binds water molecules, thereby diminishing transepidermal water loss and sustaining the skin's natural moisture equilibrium. As a multifunctional excipient, HPMC enhances cosmetic formulations by acting as a thickener, viscosity-increasing agent, emulsifier, and stabilizer. This improves the texture, consistency, and flow of products, facilitates controlled release of active ingredients, and contributes to a smooth, silky feel with improved spreadability.
Research
Clinical Evidence
High confidenceFor general cosmetic applications, concentrations typically range from 0.2% to 1.0%. Specifically, 0.2-0.5% is common for creams and lotions, while gels may utilize 1.0% or more to achieve desired viscosity and stability.
Key findings
- 01 Extensive skin tests confirm that concentrations between 0.1% and 2% are non-irritating and non-allergenic, even for sensitive, pregnant, and infant skin, ensuring long-term comfort.
- 02 Studies on topical gel formulations demonstrate optimal physical stability when HPMC is used as a gelling agent at concentrations of 1% to 4%, with specific applications at 1%, 1.5%, 2%, and 3%.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
HPMC demonstrates high stability in aqueous solutions within a broad pH range of 3 to 11 and remains stable at room temperature. It exhibits thermal gelation, readily dissolving in cold water but forming a reversible gel upon heating (approximately 50–80°C) which solidifies and holds its shape, reverting to a solution upon cooling. It tolerates salt and alcohol, though high salt concentrations may slightly increase viscosity, and alcohol content exceeding 70% can reduce its solubility.
Conflicts
- strong oxidizing agents
- high concentrations of salts (can increase viscosity)
- high concentrations of alcohol (>70% ethanol/IPA, can reduce solubility)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded HPMC is safe for use in cosmetics. Dermal irritation studies show it to be non-irritating to slightly irritating at concentrations up to 100%. It is globally recognized as non-toxic, non-irritating, and non-allergenic, with specific verification for use on sensitive, pregnant, and infant skin. While generally safe, excessive exposure may potentially lead to dryness or irritation, and a preliminary patch test is recommended for individual assessment.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Hydroxypropyl Methylcellulose is a highly versatile and well-tolerated polymer, providing significant benefits in enhancing product texture, ensuring stability, and supporting skin hydration through effective film-forming and moisture retention.
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References
Sources
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