Keracell Eyelash & Brow Boosting Serum with SymPeptide XLash 3D Lash Enhancer and human stem cell extract enhances the appearance of eyelash length and thickness and improves eyelash density in as little as two weeks of daily use. After four weeks, the improvement in length, darkness and volume is up to 66%. Super fruit extracts, Panthenol (Pro-Vitamin B5) and Malachite Extract help to stimulate new hair growth and protect against hair loss. This prostaglandin free formula will not cause iris or eyelid darkening.