Hyaluronic acid in its original form is a natural part of the body. It is a naturally occurring and moisture-binding glycosaminoglycan (sugar) compound. The synthetic production enables a high tolerance and biocompatibility. Cross-linked hyaluronic acid enables long-lasting cosmetic results and a naturally beautiful appearance. It is not the goal to achieve a refreshed appearance. The success of a treatment with cross-linked hyaluronic acid is immediately visible and lasting, but not permanent. Over time, the hyaluronic acid is broken down naturally. Treatment with hyaluronic acid should be repeated after 6–12 months to maintain the results.