Brand New,EXP:2025 Size: 30 ml / 1 oz Obagi Professional-C Serum 20% uses advanced scientific formulas developed and tested by leading Vitamin C experts. Obagi Professional-C 20% offers maximum daily antioxidant protection and greater penetration than other Vitamin C products. The greater the penetration, the greater the antioxidant benefit to your skin. Vitamin C neutralizes free radicals to prevent skin cell damage. Professional strength Vitamin C can give your skin the superior protection it needs to: Prevent premature signs of aging, including fine lines and wrinkles Protect against future damage Stimulate collagen production for firmer, more resilient skin Lighten and brighten skin for more even tone