Leucine ek branched-chain essential amino acid hai jo skincare mein skin-conditioning agent aur humectant ke taur par use hota hai. Yeh skin ke natural moisturizing factor ko support karta hai aur skin ko hydrated rakhne mein madad karta hai. Isse generally kam concentration mein add kiya jata hai taaki skin ka moisture barrier strong rahe aur skin soft aur supple bani rahe.