Help nourish and thicken lashes with Obagi Nu-Cil Eyelash Enhancing Serum, a eyelash enhancing serum designed to help target the growth phase of the lash cycle. Lipid Compounds help with the lash growing process, while Biotin helps to support the natural buildup of Keratin. This product is intended for use on the skin of the upper eyelid margins at the base of the eyelashes, avoid getting in the eyes. In the event of direct contact, rinse with cool water. Irritation, Itching sensation and/or eye redness may occur.