An 18-Month Follow-up, Randomized Comparison of Effectiveness and Safety of Two Hyaluronic Acid Fillers for Treatment of Moderate Nasolabial Folds

Hyaluronic acid (HA) filler injection is a popular nonsurgical aesthetic procedure.To compare the effectiveness and safety of 2 hyaluronic acid fillers (HAEC and HARES) for treatment of moderate nasolabial folds (NLFs).This was an evaluator- and subject-blinded split-face study. HAEC or HARES was randomly assigned to the left or right NLF at baseline. Retreatment was performed after 9 months; follow-up extended to 18 months after baseline (9 months after retreatment). Effectiveness assessments included the Wrinkle Severity Rating Scale (WSRS) and subject preference. Safety assessments included adverse events (AEs) and local tolerability symptoms recorded by subjects during 3 weeks after tre…