Nioxin’s Scalp Therapy Conditioner System 4 for colored hair with progressed thinning is the second step of a three part Nioxin regimen, specially formulated to strengthen the hair and amplify hair structure. This lightweight professional hair & scalp conditioner helps to retain moisture balance, providing hair resilience reducing breakage and leaves the hair fuller-looking.Βest results achieved when used 3 steps together.Νioxin is the n°1 salon brand for thicker and fuller hair with more than 30 years expertise in thinning hair.