This product can be applied to natural lashes and lash extensions. Features: Conditioning qualities for vital post treatment aftercare Packed with keratin, biotin and castor oil Ensures the endurance of treatment Prep lashes and brows for the next appointment Chemical treatments can affect the hair’s ability to retain moisture and strength, and without the right aftercare routine hairs can turn dry, brittle and become prone to breakage. This is why BB’s aftercare serum is an essential step in any lash and brow care regime, keeping hairs shiny, healthy, not disabled to growth.