Retinaldehyde ek vitamin A derivative hai jo skin mein retinoic acid mein convert hota hai. Yeh cell turnover ko boost karta hai, photoaging ko improve karta hai aur acne ko reduce karne mein madad karta hai. Retinol ke comparison mein yeh zyada potent hota hai lekin generally zyada better tolerate hota hai, toh sensitive skin ke liye bhi thik hai.