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What it is: A luxury day cream that protects against aggressors while powerfully combating visible signs of aging. Who it's for: Ideal for humid environments and people with normal to oily skin.What it does: This ultralight version of the original Y Theorem Repair Serum with brightening agents significantly boosts collagen production, supports cell regeneration and provides defense against environmental damage. The result is a bright and radiant complexion with a reduced appearance of fine lines and wrinkles. How to use: Massage onto the face and neck with a gentle patting motion. Apply the appropriate day or night cream on top of the serum. 1 oz. Paraben-free; paraffin-free; silicone-free; sulfate-free