Cle de Peau Beaute 1.7 oz. The Serum Our best-selling, anti-aging serum that boosts skin's suppleness and hydration while priming skin for optimal absorption of Clé de Peau Beauté skincare. What It Does Delivers vital moisture to skin, while awakening Skin Intelligence. Supports absorption and efficacy of skincare treatments that follow and strengthens skin from within. With continued use, The Serum enhances skin for a softer, glowing, and smoother texture with increased s.