Retinaldehyde ek vitamin A ka derivative hai jo skin mein jaake retinoic acid mein convert ho jaata hai. Yeh cell turnover ko boost karta hai, photoaging ke signs kam karta hai, aur acne treat karne mein help karta hai. Generally yeh retinol se zyada potent maana jaata hai, lekin prescription wale options se better tolerated hota hai — matlab results acche milte hain aur skin itna react nahi karti.