Nioxin makes your hair soft and healthy, but they also create an optimal scalp environment for hair growth. In fact, the majority of people that use Nioxin say that it gives them thicker, healthier hair within a few months Nioxin is designed for thinning hair and aims to increase the density and diameter of hair strands to give you fuller Thicker Hair. Nioxin cleansing shampoo removes dirt and debris that normally block hair follicles. It also actively removes follicle-clogging sebum, which often contains a hormone called DHT (seen as a major factor in alopecia). Acting as a DHT blocker, therefore, means that Nioxin cleanser can promote hair growth. The active ingredient in the Nioxin hair regrowth treatment is 2% or 5% minoxidil.