Benefit Whoop Lash is a gentle and conditioning lash-enhancing serum for stronger and healthier lashes. Formulated without prostaglandin or its derivatives. you can say goodbye to thin lashes and hello to fuller. thicker and longer looking lashes. Whoop Lash's formula is clinically tested and suitable even for the most sensitive eyes. Take care of and transform your lashes over time with Whoop Lash!