INCI · other · CIR review pending · used in 1 products
Isoleucine(200 Ppm)
Isoleucine is a branched-chain, essential amino acid naturally found in sources such as almond, cashew, and soy protein. Its CAS numbers are 73-32-5 and 443-79-8. In cosmetics, it is classified as a skin-identical ingredient, meaning it is a component naturally present in the skin. Its official CosIng functions include antistatic, hair conditioning, and skin conditioning.
Evidence level
weakEWG score
—Comedogenic
—Category
other● Benefits
As a skin-identical amino acid, isoleucine acts as a moisturizer by helping to maintain skin hydration. It also appears to be useful as a barrier repair ingredient, with at least one randomized, placebo-controlled trial (Pediatric Allergy and Immunology, 2014) examining L-isoleucine in the context of atopic eczema alongside ceramides.
hydratingbarrier-supportskin-conditioning
● Cautions
