Restylane ® is a safe and natural cosmetic dermal filler that restores volume and fullness to the skin to correct facial wrinkles and folds, such as nasolabial folds. Restylane is a cosmetic dermal filler made of hyaluronic acid, a natural substance that already exists in the human body. 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.