Bosley Pro's Healthy Hair Follicle Energizer is an intensive, advanced leave-in treatment. Protects and repairs the hair follicle while helping to support healthy hair function in areas of low density such as the hairline or areas where mechanical damage (hair breakage due to stress from braiding, pony tails, extensions) has occurred. LifeXtend Complex hydrates and nourishes while strengthening and fortifying the follicles and hair shaft for thicker, fuller-looking hair. Scalp Activators may help raise follicle energy levels. Biotinyl-GHK helps protect and repair hair follicles.