Generally, hyaluronic acid stock solution skin care products provide high concentration and need to be used with emulsion or essence. Sometimes, if hyaluronic acid is used alone, it has no direct moisturizing effect, and even because hyaluronic acid absorbs a lot of water from the skin, it will make the skin drier after use. Therefore, the correct usage is: after washing your face in the morning and evening, you only need to apply the mixed hyaluronic acid product to your face, and then apply moisturizing cream to lock the moisture. This will be more effective.