The main active ingredient of Tremella fuciformis extract is Tremella fuciformis polysaccharide. Tremella polysaccharide has a good moisturizing effect, and also has antioxidant, soothing and anti-allergic effects. Tremella fuciformis extract is often used as a moisturizer in cosmetics and is called "phytohyaluronic acid". In addition, Tremella fuciformis extract has a certain ability to scavenge hydroxyl free radicals and can be used in cosmetics as an anti-aging ingredient.