False Lashes False Lashes Brand: No7 It comes in a safe packaging It scores high on the aspect of utility too This No7 Lash Impact Lash Serum with its unique blend of ingredients gives visibly fuller, thicker and darker looking lashes in just 8 weeks (as tested by consumers. ) Use the serum every night for at least 8 weeks. This No7 Lash Impact Lash Serum with its unique blend of ingredients gives visibly fuller, thicker and darker looking lashes in just 8 weeks (as tested by consumers. ) Use the serum every night for at least 8 weeks.