Obagi Professional-C® Serum 20%, a high-potency Vitamin C serum that stands at the forefront of advanced skincare. This concentrated formula harnesses the power of L-ascorbic acid, a stable form of Vitamin C, to address a multitude of skin concerns and promote a brighter, more youthful complexion. With a potent 20% concentration, this serum delivers powerful antioxidant benefits, defends against environmental stressors, and helps diminish the appearance of fine lines and wrinkles.