Lengthening, volumizing and fortifying booster effect. The Eyelash Builder helps fortify and thicken lashes for a sublimated look. Lashes appear longer and fuller. The Eyelash Builder is the lash-enhancing base serum. Its triple-action formula – volume, curl and length – is the essential treatment for perfect lashes. This mascara-care product instantly lengthens lashes and adds density and volume. In just 5 weeks, lash fringe is more abundant and lashes are stronger. Apply in the morning under mascara or at night to make-up-free lashes.