A Prospective, Split‐Face, Randomized, Comparative Study of Safety and 12‐Month Longevity of Three Formulations of Hyaluronic Acid Dermal Filler for Treatment of Nasolabial Folds

BACKGROUNDData regarding several hyaluronic acids (HAs) used identically for facial tissue augmentation have heretofore been unavailable.OBJECTIVESThis prospective, split-face, randomized, two-armed study sought to determine the long-term safety and effectiveness of three HAs (HA-1 (Belotero Basic/B