Obagi Professional-C Serum 20% Strength: Obagi Professional-C Serums neutralize free radicals at all layers of the skin, before they damage skin cells and accelerate aging. Obagi Professional C-Serum Offers: Superior delivery system, resulting in greater penetration to all layers of the skin Maximum daily antioxidant protection Greater stability than competitive C products Low side effect profile Benefits: Helps maintain normal cellular turnover Builds collagen L-Ascorbic acid is essential for cross-linking collagen molecules Lightens and brightens skin Reduces inflammation Decreases transepidermal water loss Obagi Medical Professional-C Microdermabrasion Polish and Mask 2. 8oz: Helps to unveil dramatically brighter, smoother, more youthful-looking skin, with a powerful infusion of 30% L-ascorbic acid (Vitamin C) and ultra-fine crystals for exfoliation. | Obagi Medical Skin Clarifying Regimen Duo | Dermstore