Niacinamide is a derivative of vitamin B3, which is often used in whitening products because it can reduce the chance of melanin to other epidermal cells, allowing skin tone and spots to be lightened. Hyaluronic acid has a very strong ability to absorb water, and can absorb water molecules that are 1000 times its own weight. The most important effect of hyaluronic acid extract is moisturizing, which is internationally recognized as one of the best moisturizers and is more suitable for dry skin people. Hyaluronic acid is used in cosmetics, mainly because of its moisturizing properties, good moisturizing effect, and its is a component that the human body itself has, good biocompatibility, and will not conflict with other components in the human body. Low-molecular hyaluronic acid also has the function of antibacterial, anti-inflammatory, keeping skin polished, and promoting cell growth, differentiation, reconstruction and repair. The efficacy of niacinamide and hyaluronic acid is different, niacinamide mainly has a whitening effect, while hyaluronic acid mainly has a hydrating and moisturizing effect, so the two can be used at the same time to enhance the efficacy of skin care. The skin will fully absorb the nutrients on the mask paper, and the niacinamide and hyaluronic acid will be absorbed into the skin at the same time, so wash your face with water and follow up the skin care steps. It should be noted that niacinamide is an irritating ingredient, although the concentration of niacinamide products on the market are not high, however, direct contact with the skin can easily cause discomfort, so it is important to build up a good tolerance before using niacinamide products to prevent allergies.