Restylane maintains its shape using the body's own moisture. The hyaluronic acid in Restylane is hydrophilic or "water loving." As hyaluronic acid gradually degrades, each molecule binds to more water and over time, the same volume can be maintained with less hyaluronic acid. This ability of hyaluronic acid to bind to water is what helps provide long-lasting results.
Restylane is composed of non-animal stabilized hyaluronic acid. Hyaluronic acid is a substance found naturally in the human body. Restylane is fully biocompatible. There is limited risk of animal-based disease transmission or development of allergic reactions to animal proteins. No allergy testing is required before use.
Unlike rooster-derived hyaluronic acids and bovine collagen products, Restylane is free from animal proteins thereby eliminating any risks of animal-based disease transmissions or development of allergic reactions to animal proteins.