Delivers an intensive boost to areas of low density. The ultra-concentrated formula, with CoZyme-10 Vitamin Complex, targets areas of advanced thin-looking hair such as the hairline or crown. Keratin helps protect against cuticle damage and boost fragile hair. Designed to complement your NIOXIN 3-Part System, Hair Booster is used twice daily: in the morning before your Scalp Treatment and again in the evening. Its vitamin-enriched formula will give a temporary redness to skin after application.