"Perlane, which is hyaluronic acid (Q-Med, Uppsala, Sweden), remains where it is injected long enough to produce adequate augmentation in the lips for 12 months and in the nasolabial folds for 18 months, said Dr. Lowe…" Skin & Allergy News, July 2002:Vol 33;No 7
"…PERLANE provides a more durable esthetic improvement than Hylaform®, as reflected by significant treatment differences in favour of PERLANE for at least 6 months post-treatment." "The present findings suggest that less frequent repeat treatments will be required with PERLANE than with Hylaform®. …it would appear that PERLANE is likely to offer the advantage over Hylaform of reduced treatment costs…" Carruthers, A. New evidence of hyaluronic acid (NASHA) as a dermal filler. 11th Congress of the EADV, Prague, Czech Republic; 4 October 2002 Inpharma® 9 Nov 2002 No. 1363
"Less injection volume was required for "optimal cosmetic result" with hyaluronic acid gel than with bovine collagen…" "…RESTYLANE provided a more durable aesthetic correction than Zyplast®, as indicated by significant treatment differences in favor of RESTYLANE that were evident as early as 2 months after treatment and were maintained for at least 6 months after treatment." Narins, RS., et al: A randomized, double-blind, multicenter comparison of the efficacy and tolerability of Restylane versus Zyplast for the correction of nasolabial folds. Dermatol Surg 2003;29:588-95