L'Oréal 0.3% retinol night serum is a skincare product that contains 0.3% retinol, a derivative of vitamin A. It is designed to be used at night to promote skin cell turnover, reduce wrinkles, and improve skin texture. The serum gradually releases the retinol over time, minimizing irritation. It also contains moisturizers and antioxidants to nourish and protect the skin. It is important to start with a lower concentration of retinol and use sunscreen during the day when using this product. Overall, it aims to improve the appearance of wrinkles and enhance skin texture.