- The future of Vitamin C has arrived. Potent-C™ Targeted Spot Brightener unleashes the strength of powerful antioxidants and THD Ascorbate, an ultra-stable breakthrough form of Vitamin C that is 50 X more powerful than traditional Vitamin C. Packed with a concentration of 10% THD Ascorbate, this potent spot brightener is amplified by 3% Vitamin E and 2% Ferulic Acid, providing powerful antioxidant benefits. Gwennis and Angelys help reduce and brighten the look of dark spots, while Aloe and Allantoin help soothe the appearance of skin. Cleanse skin and spot treat affected area twice daily. Must use sunscreen daily to maintain results and prevent future discoloration.