New in box, never used Gold-stabilized vitamin C and glycolic acid serum for dramatically brighter, healthier-looking skin. One-of-a-kind Vita-C Complex enhances L-ascorbic acid stability and potency to brighten skin  Glycolic acid exfoliates dulling surface cells to enhance vitamin C delivery In 2 Weeks: 91% saw brighter, smoother skin with more glow 94% agreed skin feels softer and more hydrated 28% brighter skin at 4 weeks, as clinically measured through expert grading in an independent study. Proven results reported by trial participants in a 2-week clinical study.