This Obagi Medical Professional-C Serum features a potent 20% L-Ascorbic Acid formula designed to brighten and improve skin texture. Ideal for daily use, this vitamin C serum helps to protect against environmental damage while promoting a radiant complexion. The serum is easy to apply with a dropper and recommended for use on the face, neck, and chest. Suitable for morning application before sunscreen or makeup, it supports healthy, glowing skin.