INCI · other · CIR review pending · used in 5 products
Isoleucine
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 the skin's natural hydration. It also appears to be useful as a barrier repair ingredient, supported by at least one randomized, placebo-controlled trial examining L-isoleucine in the context of atopic eczema.
hydratingbarrier-supportskin-conditioning
● Cautions
