--- Professional thickening treatment for coloured hair with progressed thinning. Delivering denser-looking and restored moisture balance to your hair. ------ Nioxin System Kit 4 is clinically proven to reduce hair fall, due to breakage, by up to 91%. --- ------ The 3-step System includes Scalp Shampoo: removes dirt and sebum; Scalp Conditioner: provides hair strength; Scalp & Hair Treatment: increases the volume of each hair strand. --- ------ 85% of customers who tried the System Kits noticed a thickening effect. (vs. non conditioning shampoo **based on a survey among 230 US panellists concerned about thinning hair conducted by SIRS, 2016) --- ------ Dermatologically tested. --- ------ Includes Shampoo 300ml, Conditioner 300ml and Treatment 100ml.