Retinol is a type of vitamin A derivative that is used to improve the appearance of fine lines, wrinkles, and other signs of aging. Retinol works by increasing cell turnover and stimulating collagen production, which can help to reduce the appearance of fine lines and wrinkles, improve skin texture, and even out skin tone. Retinol should be used with caution and gradually introduced into a skincare routine, as it can cause sensitivity and dryness in some individuals.