Abstract:
Background: Dihydrooxyresveratrol, a new derivative of Oxyresveratrol, indicated more potent tyrosinase inhibitory activities compared to Oxyresveratrol. Previous studies showed0.1% concentration of Dihydrooxyresveratrol can effectively promote facial skin whitening equally to 2% alpha arbutin. In this study we compare the efficacy of 0.2 % Dihydrooxyresveratrol and 2% Alpha arbutinfor facial whitening.
Objective: To compare efficacy of 0.2% Dihydrooxyresveratrol and 2% Alpha arbutin for facial whitening in Thais.
Material and Methods: Twenty-one Thai volunteers, aged 20-60 years, were enrolled. Study design was Double-blind, randomized, controlled clinical trial. Randomly selected for applied either 0.2% Dihydrooxyresveratrol cream and 2% alpha arbutin cream in a split- face design (right and left sides), twice daily for 12 weeks. Evaluation was performed every 4-week interval using mean melanin index measured by Mexameter MX18, photographs from VISIA® and records of side effects. Volunteers satisfaction was assessed by questionnaires at 12th week.
Results: Mean melanin index of the sides that applied 0.2% Dihydrooxyresveratrol cream before treatment to 12th week (From 269 ± 63.39 to 227.85 ± 62.77 at forehead and from
216 ± 49.20 to 182.28 ± 50.13 at cheeks ) and 2% Alpha arbutin before treatment to 12th week (From 271.47 ± 64.83 to 237.80 ± 67.78 at forehead and from 214.71 ± 48.58 to 188.61 ± 51.36 at cheeks). Both groups demonstrated statistically significant reduction from the baselines at 4th week, 8th week, and 12th week, respectively. And paired differences of mean melanin index showed 0.2% Dihydrooxyresveratrol cream were statistically significant more effective than 2% Alpha arbutin cream in facial whitening at 4th week and 12th week. However, global photographic scores between both sides revealed no statistically significant in results. Most volunteers rated 0.2% Dihydrooxyresveratrol cream as much improvement for satisfactory. Side effects were recognized only mild in both groups.
Conclusion: 0.2% Dihydrooxyresveratrol cream were statistically significant more effective than 2% Alpha arbutin cream in facial whitening.