THE BRIGHTENING SERUM. Benefits: See Brighter, Firmer-Looking Skin in 1 Week*. Visibly firms & supports elasticity. Targets hyperpigmentation & reduces visible post-acne marks. Key Ingredients: 12-Hr Time-Release Vitamin C: all-day brightening for rapid results, crafted through an enzymatic technology in Japan. Pro-Glutathione Antioxidant Booster: targets hyperpigmentation & is 13x more antioxidant power than pure vitamin C (ascorbic acid) to brighten skin.*. Research Results: Proven to reduce the look of post-acne marks in 1 week*. 100% agree serum absorbs quickly and is gentle*. *based on a clinical study of 18 panelists.