Hyaluronic acid (polysaccharide) is naturally found in the skin. Its main function is to bind and retain water. In practice, this means that it helps skin retain its moisture. With age, hyaluronic acid concentrations decrease. During the treatment, dermal fillers containing an active ingredient, hyaluronic acid, are subcutaneously injected. Hyaluronic acid fully integrates with the patient’s skin and does not interfere with its natural function, allowing for a natural and free flow of nutrients. Over time, acid is absorbed without bringing any adverse effects. The most popular fillers on the market are for example Juvederm, Restylane and Stylage. Depending on the filler used in a treatment, the effects last for about a year.