Polyquaternium-4 ek quaternized cellulose-based cationic polymer hai jo hair aur skin care mein use hota hai. Yeh ek conditioning film banata hai jisse hair smooth rehte hain aur frizz kam hota hai. Antistatic properties deti hai, texture ko enhance karta hai aur hair ko shiny banata hai. Yeh mainly formulation aid ke taur par kaam karta hai, therapeutic nahi hai.