Science
Mechanism of Action
On the skin, Potassium Hydroxystearate acts primarily by stabilizing emulsions, efficiently blending oil and water-based ingredients to improve overall product texture and consistency. Its active moiety, hydroxystearic acid, has been shown to function as a peroxisomal proliferator-activated receptor-α (PPARα) agonist. This agonism modulates the expression of p53, matrix metalloprotease-1 (MMP-1), and collagen, a mechanism associated with reducing the appearance of age spots and refining conspicuous pores.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
This ingredient exhibits optimal stability within formulations buffered to a pH range of 5.0 to 9.0, where it exists in its stable salt form. Formulators should note its pH sensitivity, as compatibility with highly acidic ingredients or formulations with pH levels below 5.0 may be limited, potentially leading to hydrolysis or other chemical reactions that could compromise product stability and efficacy.
Conflicts
- Acidic ingredients
- Low pH formulations
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that hydroxystearic acid and its simple salts, including Potassium Hydroxystearate, are safe for cosmetic use. This safety is contingent on formulations maintaining a biologically compatible pH range between 5.0 and 9.0, and when the finished product is formulated to be non-irritating and non-sensitizing.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Potassium Hydroxystearate is a valuable ingredient, providing essential formulation stability and textural enhancement, complemented by a promising biological mechanism for addressing age spots and pore appearance, all within a well-established safety profile.
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