Science
Mechanism of Action
This ingredient acts as an amphiphilic emulsifier and surfactant, reducing interfacial tension to stabilize oil-in-water mixtures and effectively cleanse skin, hair, or teeth. As a salt of linoleic acid, it supports skin barrier function through incorporation into ceramides and promotes wound healing by enhancing skin hydration and facilitating migration of immune cells and keratinocytes. It also exhibits potent cross-kingdom antimicrobial effects against various bacteria and fungi, provides moisturizing properties, and may contribute to skin brightening by promoting epidermal peeling and inhibiting tyrosinase.
Research
Clinical Evidence
Medium confidence2.74%
Transparency
Dusting Analysis
No data suggests this ingredient is commonly 'dusted' in formulations for marketing without functional benefits.
The Formula
Formulation
Stability
Aqueous solutions of basic salts like potassium linoleate typically have a pH greater than 7.0, with similar compounds showing a 1% solution pH range of 9.5 to 11.4. The ingredient is noted for exceptional stability and compatibility. While its estimated water solubility is low (6.568 mg/L @ 25 °C), it functions effectively as a water-soluble/dispersible surfactant. Formulations must ensure it is non-irritating and non-sensitizing, as aqueous dilutions may appear inconsistently cloudy.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Potassium Linoleate is safe in cosmetic uses and concentrations when formulated to be non-irritating and non-sensitizing. The EPA Safer Choice program classifies it as a 'green circle' chemical, indicating low concern. However, PubChem's GHS classification suggests it 'Causes serious eye irritation' based on 91.7% of reports, though the EWG Skin Deep database rates its overall irritation (skin, eyes, or lungs) as 'low'.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Potassium Linoleate is a valuable multi-functional ingredient, offering effective cleansing, emulsification, skin barrier support, and notable antimicrobial and wound-healing benefits, provided it is meticulously formulated to be non-irritating.
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References
Sources