Inspired by hair science, Lancôme combined 4 of the most concentrated and common amino acids found in hair to create a serum that revitalizes eyelashes for a healthier look. Ultra-precise by design, our targeted brush allows for gentle application in even the hardest to reach areas of the lash line. Lancome’s lash serum is ultra safe for daily use on eyelashes as it has been tested under opthamological control as well as on Sensitive eyes.