The anti-wrinkle oil serum Cosrx Retinol 0.5 can help you against loss of elasticity, dryness, and other signs of skin aging. It contains concentrated retinol, una one of the best weapons to combat the changes that the skin undergoes due to aging. Retinol reduces wrinkles, firms the skin, and gives it a healthy and radiant appearance. It restores your skin's youthful freshness in just 4 weeks.