Hyaluronic acid can be divided into macromolecules and micromolecules, which have long-term or short-term effects. The maintenance time varies according to different materials, generally ranging from 6 months to 2 years. Hyaluronic acid is a substance existing in the body itself and will be metabolized and absorbed by the body. Then the factors that determine absorption and metabolism are:

1) Different personal conditions, including obesity and age, will affect the metabolic rate: people with thin physique absorb faster after injection, while those with fat physique absorb faster. In addition, people of different ages inject the same dose of hyaluronic acid into the same site, and the metabolic time is different. Older skin contains less hyaluronic acid, and the metabolism after injection is faster than that of younger skin, and the retention time will be shorter.

2) The first absorption ratio will be faster. Because hyaluronic acid enters the skin for the first time, skin cells will quickly absorb foreign bodies.

3) Personal habit: Drinking it late at night will double the absorption of hyaluronic acid.

4) Different products, different molecular structures and different absorption rates.

5) Injection site and expression activity, injection site also determines the retention time of hyaluronic acid. Because there are no active muscles in the nose, chin and other parts, it lasts for a relatively long time, while the nasolabial groove, mental groove and lips are the areas where our face often moves, so the time will be shorter.

6) Related to local blood circulation, the parts with rich blood circulation are absorbed faster.