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The most common moisturizing ingredients in skin care products are hyaluronic acid, ceramide and squalane. Hyaluronic acid is the most common moisturizing ingredient in skin care products. Hyaluronic acid, also known as hyaluronic acid, is added in many skin care products. It can enter the dermis of the skin and lift moisture from the muscle base. Ceramide and squalane are also important ingredients to keep skin moist. The use of hyaluronic acid can be said to be very common in skin care products, because if skin care products are used after hyaluronic acid, the water-locking ability of skin will be increased by 100 times than usual, and each hyaluronic acid molecule will absorb more water than itself. Therefore, after using hyaluronic acid, it will be found that the previous skin care products will be more moisturizing and have stronger moisturizing performance, so both oily skin and dry skin need this ingredient to moisturize. However, ceramide exists in human skin itself and has moisturizing ability. When applied to skin care products, it can provide skin with water locking ability. If the water loss is serious, ceramide can be used to replenish water. Squalane is very popular in recent years. Its moisturizing ability is another form of intercellular lipid, and its permeability is also very strong, because it will form another component called squalene after entering the skin, and it will form cholesterol after entering the deep layer of the skin, which has stronger hydrating ability. Ingredients like calcium pantothenate or trehalose can provide moisture for the skin, and can also moisturize the stratum corneum more deeply.