Product Details Condition and strengthen your eyelashes with Lancôme's Lash Revitalizing Serum a fortifying eyelash serum for nourished thicker looking lashes. Just like hair eyelashes are susceptible to damages. Cils Booster Lash Revitalizing Serum helps to condition and strengthens lash feel. The eyelash serum leaves lashes feeling conditioned protected nourished stronger and looking thicker. How To Use 1. Begin with a clean eye area free of makeup. After cleansing and moisturizing skin, apply the lash serum along the upper and lower lash lines (like a liquid eyeliner). 2. Next, apply serum from lash root to tip (as you would apply mascara). 3. Wait 1 -2 minutes before eye makeup application. Apply 2x a day as a part of your morning and evening skincare routine. Pro tip: For even fuller lashes, apply Cils Booster XL Lash Primer to eyelashes followed by your favorite mascara.