What it is: An overnight treatment serum that strengthens and conditions with a thickening complex for fuller, thicker-looking lashes and brows.What it does: The serum lets you turbocharge your lashes and brows while you sleep. The powerful yet gentle treatment leaves lashes and brows feeling stronger, nourished and conditioned. It is made with a thickening complex that includes 16 amino acids, rice protein, panthenol and hyaluronic acid.Research results:In a consumer test on 111 women after using the product for 12 weeks:- 78% said lashes and brows felt nourished- 75% said lashes felt stronger- 70% saw thicker browsHow to use: Apply at bedtime, after cleansing the eye area. Apply eyelash enhancer along base of lashline, from inner corner to outer, and brush onto lashes. To use on your brows: using short strokes, apply throughout the brow, end to end.