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Hourglass Cosmetics Equilibrium Biomimetic Skin Active Serum, 1.7 oz. What It Does A revolutionary nighttime serum that helps defend against visible signs of aging. This oil-free formula is powered by an advanced delivery system that releases ingredients below the skin's surface, unlike traditional serums that sit on the skin. The Night Active Serum is formulated with the Hourglass Cell Balancing Complex, a powerful blend of youth lipids that rebalances restores and renews the skin barr.