Dermalogica Smart Response Serum is an adaptive face serum that adjusts to what skin needs in real time, hydrating dry zones, brightening dullness, soothing redness, and refining the look of fine lines all in one treatment. The lightweight serum reads skin signals on application and responds where it is needed most. Niacinamide, lactic acid, and a microbiome-active blend address multiple concerns without overwhelming the skin with too many actives at once. Texture is silky and absorbs quickly, layering cleanly with the rest of the routine. Use it morning and evening when skin reactivity, weather, or stress make the day's needs unpredictable. Key Benefits Adapts to changing skin needs in real time, hydrating where dry and soothing where reactive or compromised. Brightens visible dark spots and dull patches with niacinamide and lactic acid that work over consistent use. Soothes and reduces the look of redness while improving the appearance of fine lines and wrinkles gradually. Suitable for daily morning and evening use across most skin types, including reactive and combination skin. How to Use Apply each morning and night after cleansing and toning. Allow one minute for the product to absorb before layering.