Hair Booster delivers an intensive boost to areas of low density. It is an leave-on booster for areas of concern, such as receding hairline or a low-density crown. Use twice daily. Distribute with fingertips from root to tips on areas of advanced thin-looking hair and along the hairline. Apply Hair Booster prior to applying your NIOXIN Scalp Treatment. Advanced formula with Vitamin Complex provides a warming sensation and gives temporary redness to skin after application.