DeCai Hyaluronic Acid should be a Korean hyaluronic acid, there is no certificate in China, it is not legal. DeCai hyaluronic acid belongs to the medium molecule, this hyaluronic acid is very hard, that is, if played into the skin, early touch is very hard, the feel is not very good. This kind of hyaluronic acid cannot be used to play to the superficial layer, such as tear trough, subcutaneous, etc. It is mainly used for deep support and filling, such as playing to the periosteal layer, the hard feeling will be better to touch. This kind of hyaluronic acid is mainly suitable for filling in the deep periosteal layer, and try not to fill to the subcutaneous layer, which is relatively safer. But the domestic is no certificate, it is not recommended to play, once the problem is very troublesome.