Retinol 0.3% ek low-concentration vitamin A derivative hai jo skin mein jaake retinoic acid mein convert hota hai — isse cell turnover badhta hai, collagen production stimulate hoti hai, aur fine lines, texture aur uneven tone mein improvement aati hai. Yeh beginners ke liye ek accha starting point hai kyunki yeh relatively well-tolerated hota hai.