Restylane® is a cosmetic dermal filler made of hyaluronic acid, a natural substance that already exists in the human body. The hyaluronic acid in Restylane® is a crystal-clear gel called NASHA™ or Non-Animal Stabilized Hyaluronic Acid. NASHA™ is completely biocompatible with human hyaluronic acid.
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 lasting results.
Unlike rooster-derived hyaluronic acids and bovine collagen products, Restylane® is free from animal proteins. This limits any risk of animal-based disease transmissions or development of allergic reactions to animal proteins.