The W7 Absolute Lash & Brow Serum is a 2-in-1 formula made to condition and improve the quality of lash and brow hairs. Using the thin brush, apply along the lash line gently, followed by combing the brow hairs with the thicker, barrel brush. This can be done daily. Formulated with vitamin B5, lashes will appear longer and fuller with brows looking healthier over time.