Obagi Nu-Derm Toner is a refreshing blend of natural ingredients and herbs that hydrates and tones the skin while restoring its normal pH balance. It prepares the skin for application of Obagi Clear. CAUTIONS : Hydroquinone (HQ) and Tretinoin / Retinol products should not be used by pregnant women, women who intend to become pregnant in the near future, or women who are lactating/breast feeding. Test for skin sensitivity before using by applying a small amount to an unbroken patch of skin and check within 24 hours. Minor redness is not a contraindication, but where there is itching or vesicle formation or excessive inflammatory response, product should be discontinued and physician consulted. Close supervision is recommended. Sunscreen use is an essential aspect of HQ therapy because even minimal sunlight exposure sustains melanocytic activity. Avoid contact with eyes, nose, mouth, or lips. In case of accidental contact, rinse eyes, nose, mouth, or lips with water and contact physician.