Hello, hyaluronic acid, scientific name hyaluronic acid, is a natural substance that the human body itself has. Its advantages are relative safety, little side effect and basically no allergic reaction; There is not much requirement for age; Through injection into the dermis, the discomfort is small, the operation time is short, and the postoperative recovery is fast. At the same time, hyaluronic acid will be absorbed by human body within 6- 18 months. If you are not satisfied with the effect of hyaluronic acid injection, you can wait for hyaluronic acid to be absorbed by the human body before injection or choose other methods not to take it out. It is recommended that you choose a regular medical institution and doctor to inject hyaluronic acid for you.