Get visibly radiant skin AM and PM with this duo. Our bestselling Glass Skin Refining Serum promotes visibly hydrated, smooth, luminous skin. Our breakthrough Retinal For All Renewing Serum visibly reverses and prevents signs of aging with a powerful yet gentle dose of 0.1% retinal. Skin will appear firm and more even-toned with a youthful glow. The results speak for themselves: Glass Skin Refining Serum (40ml):* - 100% said the serum is suitable for sensitive skin - 96% saw smoother and softer skin - 96% saw increased hydration and improved dry patches - 92% saw brighter, more luminous, and healthier skin with a radiant glow Retinal For All Renewing Serum (30ml):* - 50% reduction in fine lines and wrinkles¹˒² - 50% improvement in brightness¹˒² - 62% improvement in skin texture¹˒² - 67% improved skin barrier⁴ - 0% irritation³ *3rd party consumer study results - Measured by Corneometer, Tewameter, TEWL, Cutometer, Visia Scan instrumentation based on a 4-week and 12-week independent clinical study conducted by expert clinical graders. - Percentages reflect a range of results and may indicate maximum benefits achieved. - “Zero irritation” claim refers to a near 0% water loss to skin, post formulation application, as measured in a 4-week independent clinical study using a Tewameter, indicating virtually no skin-barrier disruption. - “Improved skin barrier” claim refers to a 67.62% improvement of the skin barrier, as measured in a 12-week independent clinical study using a Tewameter, indicating 67.62% less transepidermal water loss (TEWL). - S. Mukherjee, A. Date et al., Clin Interv Aging. 2006 Dec; 1(4):327 348.doi: 10.2147/ciia.2006.1.4.327 - Novel research by Kang S, Kim K, Jun SH, et al. Anti-Irritant Strategy against Retinal Based on the Genetic Analysis of Korean Population: A Genetically Guided Top-Down Approach. Pharmaceutics. 2021 Dec; 13(12): 2006. DOI: 10.3390/pharmaceutics13122006 - G. Siegenthaler et al., Retinol and retinal metabolism, Biochemical Journal, 1990, 268,pp 371 378