The Obagi Professional C Serum 20% is a powerful treatment formulated with a high concentration of L-Ascorbic Acid (Vitamin C) to address visible signs of aging and environmental stress. This advanced formula works to brighten the complexion, improve the appearance of fine lines and wrinkles, and provide antioxidant protection. It is specifically designed to target dullness and uneven skin tone, supporting the skin's natural collagen production for a firmer, more youthful look. Ideal for normal to oily skin types seeking significant corrective and preventive skincare benefits.