Hyaluronic acid for injection is only used after crosslinking in clinic. According to the cross-linking degree or molecular size of hyaluronic acid raw materials, various models are made to meet the different requirements of facial plastic surgery, with different timeliness and functionality.
As far as timeliness is concerned, different kinds of hyaluronic acid can last for 6-24 months, and then it will be slowly metabolized out of the body. As far as functionality is concerned, different kinds of hyaluronic acid have different functions of moisturizing and rejuvenating skin, removing wrinkles, filling or supporting plastic molding.
Hyaluronic acid in cosmetics is uncrosslinked or slightly cross-linked, which has a short-term moisturizing effect and lasts for about 2 ~ 3 days.
Extended data:
People who should not inject hyaluronic acid:
People with age 1 and less than 18;
2. Local skin has inflammation and infection;
3. Recent use of anticoagulant drugs or abnormal coagulation;
4. Pregnant and lactating women; People allergic to hyaluronic acid.
Injection of hyaluronic acid must go to a regular medical institution, select qualified products, and be injected by experienced doctors with corresponding professional qualifications.
References:
People's Daily Online-Hyaluronic Acid: "God Clay" is not always reliable.
People's Daily Online-Unveiling the Mystery of Hyaluronic Acid: These people do not recommend injecting Hyaluronic Acid.