Saturated fatty acid derived from plant and animal fats. In cosmetics, it functions as an emulsifier, thickener, and co-emollient.
Topical application
DVery weak or conflicting data.
A formulation component with no standalone therapeutic activity. Safety in cosmetic use confirmed by CIR.
Stearic Acid (C18H36O2) is a saturated 18-carbon fatty acid. Sourced from plant fats (cocoa butter, shea, coconut) and animal fats. The skin synthesises it as part of the lipid matrix. Mechanism. In cosmetics it performs three roles: o/w emulsifier (after alkaline neutralisation), cream thickener, co-emollient. Forms liquid-crystalline structures in emulsions and stabilises texture across temperatures. Where applied. Face and body creams, soap, cleansing bars, balms. Concentration 1-10%. In Spain it features in Eucerin, Bioderma, Avène. Evidence base. Free stearic acid is naturally present in the stratum corneum and supports the lipid matrix together with ceramides and cholesterol. Safety. CIR confirmed safety at all concentrations. In some acne-prone patients high leave-on concentrations (>5%) may trigger comedones – Fulton rating 2. Pregnancy and lactation – safe.
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
The Evigrade extension adds an evidence panel to Wildberries, Goldapple, Letu, iHerb, Sephora and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Stearic Acid is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Stearic Acid suits: dry, normal, combination.
Saturated fatty acid derived from plant and animal fats.
On the Fulton scale 2/5 – low comedogenicity. For acne-prone skin, a rating of 3 or higher suggests choosing an alternative.
The INCI name is Stearic Acid. It may also appear as: Стеариновая кислота, Stearis Acid.
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