Science
Mechanism of Action
Lactic Acid/Hydroxystearic Acid Copolymer operates by forming microscopic containers that encapsulate and facilitate the controlled release of active ingredients into the skin, thereby potentially improving their penetration and overall efficacy. Its polymeric structure also contributes to forming a protective film on the skin's surface and stabilizing emulsions. Upon gradual degradation, the copolymer releases lactic acid, which can then contribute to gentle exfoliation and improved skin hydration. Related copolymers further demonstrate utility as moisturizers and agents that enhance the water-resistance of formulations.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has not specifically reviewed Lactic Acid/Hydroxystearic Acid Copolymer. However, its constituent monomers have been assessed individually. Lactic Acid is considered safe for consumer use at concentrations up to 10% (with a final pH ≥ 3.5) and up to 30% for professional use (pH ≥ 3.0), provided daily sun protection is employed. The SCCNFP indicated Lactic Acid is safe in cosmetic products at concentrations up to 2.5% at a pH ≥5. Hydroxystearic Acid is deemed safe for cosmetic use when formulated to be non-irritating and non-sensitizing. Related polymers, such as Polyhydroxystearic Acid, have been reported in cosmetics up to 14.2% (e.g., in lipsticks), and Polylactic Acid (a component of a similar copolymer) is FDA-approved for surgical devices and as a food contact substance.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While Lactic Acid/Hydroxystearic Acid Copolymer demonstrates promising functionalities as a delivery system, film-former, and emulsifier based on its mechanism and monomer safety, specific clinical efficacy and comprehensive safety data for the copolymer itself are currently limited.
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References
Sources