Best-selling Lash & Brow Conditioning Serum contains powerful antioxidants, a multi-vitamin complex and conditioning actives that combine to create an intensive, daily serum that thoroughly nourishes your lashes and brows. Used daily, this serum provides lashes and brows with everything they need to appear instantly conditioned, as well as provide long-term benefits with continued use to help give a fuller appearance to natural lashes. When used beneath mascara, it can also act as a primer, providing multi-use benefits.