Nioxin Intensive Therapy Follicle Booster, for all hair types, is an intensive booster for areas of excessively thin-looking hair. An intensive leave-in scalp treatment for excessively thin-looking areas and low density hair lines. It provides vitamin enriched nourishment onto the scalp and protects hair against the phototoxic effects of sunlight and the damaging effects of DHT (Dihydrotesterone).