Obagi Professional C Serum 20%, Vitamin C Facial Serum with Concentrated 20% L Ascorbic Acid for Normal to Oily Skin, 1.0 Fl Oz

IMPORTANT SAFETY INFORMATION For external use only. Avoid direct contact with eyes, nose, mouth and lips. Some users of this product may experience a slight tingling, which should diminish with continued use. If tingling becomes severe, stop use and consult a doctor.