Science
Mechanism of Action
As a low molecular weight polyethylene glycol, PEG-9 functions by dissolving and solubilizing active substances, particularly those with low water solubility, thereby acting as an effective carrier. It improves formulation consistency and creates a protective layer on the skin, contributing to extended hydration. Its ability to penetrate the skin further enhances the absorption and bioavailability of other chemicals. Additionally, PEG-9 serves as a humectant, attracting and retaining moisture, and can act as a dispersing agent and surfactant.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
PEG-9 may form complexes with certain active ingredients, potentially reducing their efficacy or bioavailability. Individual formulation testing is recommended to ensure the stability and activity of co-formulated active substances.
Conflicts
- Certain active ingredients (due to complex formation)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) deems PEG compounds, including low molecular weight forms like PEG-9, safe for use when formulated free from impurities such as ethylene oxide and 1,4-dioxane. While allowed in EWG VERIFIED products, it carries use restrictions and warnings. The U.S. FDA has approved PEG-9 for specific, limited use in food products.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-9 is a valuable formulation aid, enhancing ingredient delivery and hydration, with a generally low irritancy profile and broad skin compatibility when correctly formulated.
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References
Sources