3-Butanediol (1,3-butylene glycol) ek chhota diol hai jo skincare mein humectant, solvent aur mild antimicrobial agent ke taur pe use hota hai. Yeh skin ki moisture ko lock karta hai aur formulations ko stable rakhta hai. Isko generally safe aur well tolerated maana jata hai jab sahi concentration mein use kiya jaye.