Slow down the aging process and boost glowing skin with the Obagi Professional-C Serum 20%. This potent potion of highly concentrated L-ascorbic acid (vitamin C), enriches your skin with antioxidants that neutralize free radicals and protect the skin from environmental damage. This serum boosts collagen growth to improve the elasticity of the skin and minimizes the appearance of fine lines and wrinkles by preventing premature aging. It tightens sagging skin for a firm and youthful look. To top it off, the Professional-C Serum 20% stimulates the skin to recover from previous damage and reveals a luminous, healthy glow.