COSRX The Retinol 0.5 Oil is an advanced anti-aging treatment containing 0.5% pure retinol, Super Vitamin E, and Squalane. This concentrated formula helps reduce fine lines and wrinkles while improving skin firmness and elasticity for a more youthful appearance. This is a personal care product containing retinol, which should be used with caution. For best results, apply 1-2 drops in the evening and start with 2-3 times per week, gradually increasing frequency as tolerated. A patch test is recommended before first use. The product should be stored in a cool, dark place and used within the recommended period after opening. Not recommended for use during pregnancy or breastfeeding.