2 in 1 product for Lash & Brows Our Lash & Brow Booster from Augenmanufaktur is the optimal sales product for your customers. The booster stimulates eyelash and eyebrow growth and helps create thicker, fuller lashes and brows. It has a strong effect and protects against breakage and premature failure. It is completely free of prostamide, parabens, perfume! The eyelashes grow longer, healthier and fuller - even with eyelash extensions. application The application couldn't be easier: After cleaning your eyelashes and eyebrows with an oil-free make-up remover, apply the serum once in the evening (like an eyeliner), along the upper (and lower) lash line.