Were any scientific studies done on Restylane?
Yes. A double-blind study (randomized) enrolled 138 subjects who each received split-face treatment with Restylane in one nasolabial fold and Zyplast (collagen) in the other fold. After 6 months, more than twice (2x’s) as many Restylane-treated folds continued to experience excellent results – versus the collagen-treated folds.