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BEST FOR: All Skin Types, Anti-Aging WHAT IT IS A Vitamin C serum that boosts radiance, helps firm skin and visibly diminishes fine lines, wrinkles and pores for smoother-looking skin. Formulated with 10.5% L-Ascorbic Acid and 2% Ascorbyl Glucoside plus Hyaluronic Acid, this patented, water-free concentrate is a Kiehls customer favorite. WHAT IT'S GOOD FOR Helps visibly reduce lines and wrinkles while helping firm skin over time Smoothes skins texture and helps visibly minimize the appearance of pores Antioxidant Vitamin C penetrates skins deeper surface layers and remains effective in skin for up to 6 days Provides visible results in just 2 weeks Dermatologist-tested for safety DID YOU KNOW? Kiehls became pioneers in Vitamin C skincare when we first stabilized Vitamin C in our efficacious, water-free concentrate. Our patented Vitamin C serum is highly stable ensuring that our formula is concentrated with an efficacious amount of Vitamin C while still being suitable for sensitive skin. Within our formula, our Vitamin C penetrates skins deeper surface layersup to 10 layers deep!