Retinol Serum is a skin care product that contains retinol, a form of vitamin A. It is known for its anti-aging properties, as it promotes collagen production and reduces fine lines and wrinkles. It can also help reduce acne and improve the appearance of sun damage. However, retinol serum can also be irritating and should be introduced slowly into the skin care routine to avoid unwanted side effects. It is important to use it only at night and always wear sunscreen, as it can make the skin more sensitive to sunlight.