A potent Peter Thomas Roth dark spot treatment powered by advanced skin-brightening actives and THD Ascorbate-a mega-potent, ultra-stable form of Vitamin C. Benefits 10% THD Ascorbate (50X more powerful than traditional Vitamin C) is boosted by 3% Vitamin E and 2% Ferulic Acid for potent brightening benefits Gwennis, an active algae extract, helps reduce the look of dark spot size by up to 75%* Angelica Root Extract also helps minimize the look of dark spots Key Ingredients 10% THD Ascorbate Vitamin C - An ultra-stable scientific breakthrough form of Vitamin C that is 50X more powerful than traditional Vitamin C to help brighten skin's appearance and defy signs of aging 3% Vitamin E and 2% Ferulic Acid - Provide antioxidant benefits and work synergistically to help boost the performance of Vitamin C Gwennis - An active algae extract that helps reduce the look of dark spot size by up to 75%, based on an in vivo study after 12 weeks