Strengthen and moisturize hair with Nioxin's three part System 2 Scalp Therapy Conditioner for Natural Hair with Progressed Thinning. Nioxin System 2 Scalp Therapy Conditioner 5.07 fl oz. Strengthen and moisturize hair with Nioxin's three part System 2 Scalp Therapy Conditioner for Natural Hair with Progressed Thinning. This density-protecting professional hair care product helps retain moisture balance, providing hair resilience thanks to its BioAmp technology. Lightweight Nioxin conditioner is specially designed for hair with progressed thinning and leaves it fuller looking. Nioxin's Scalp Therapy Conditioner is the second step of a three part Nioxin regimen, designed to strengthen the hair and amplify hair structure.