Non-ionic surfactant / emulsifier. Functional formulation ingredient with no standalone activity on the skin.
Topical application
CWeak evidence. In vitro data, open-label studies, or expert consensus.
Inert formulation ingredient. Safe, no standalone activity.
C12-13 Aleth-9 is a non-ionic surfactant – a mix of ethoxylated C12-C13 alcohols with an average degree of ethoxylation of 9 (nine ethylene oxide groups). Mechanism. Works as a solubiliser and emulsifier: helps incorporate poorly water-miscible components (oils, essential oils, silicones, UV filters) into the aqueous formula base. Forms micelles carrying hydrophobic molecules. Does not stay on skin – rinses off with water. Where applied. Micellar waters, cleansing toners, shampoos, lotions, shower gels, sunscreen emulsions. Concentration 0.5–5%. In Spain in Bioderma Sensibio H2O, La Roche-Posay Effaclar Micellar Water, ISDIN. Safety. CIR confirmed safety of the ethoxylated alcohol family in cosmetics in 2018. Contact allergies and irritation are rare. Non-comedogenic. Topical systemic absorption is low. Pregnancy and lactation – safe. Used without restriction. 1,4-Dioxane controversy. Ethoxylated ingredients can theoretically contain trace 1,4-dioxane (an ethoxylation byproduct). Quality producers monitor levels – SCCS and AEMPS limits are respected. Functional role. A formula surfactant aid. No standalone skin activity.
Irritation potential
LowAllergen risk
LowPregnancy
SafeThe 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.
C12-13 Aleth-9 is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Non-ionic surfactant / emulsifier.
The INCI name is C12-13 Aleth-9. It may also appear as: C12-13 алет-9.
Published: · updated: