Etude House My Lash SerumEtude House My Lash Serum is a nourishing eyelash serum designed to promote lash growth, thickness, and strength while preventing lash fall. It's formulated with ingredients like biotin and panthenol to strengthen lashes and potentially stimulate growth. The serum, with a clear, lightweight gel texture, is applied with a mascara like brush to the lash line, similar to applying eyeliner, and can also be used on eyebrows.