The Nioxin System 1 Duo is a professional hair care set specifically designed to amplify hair texture and protect the hair against breakage. This regimen helps cleanse and condition hair, promoting a thicker, fuller appearance for fine, natural hair that is showing signs of light thinning. Use this system daily to refresh the scalp and maintain a healthy environment for hair growth. The combination of the shampoo and conditioner works in tandem to provide strength and resilience to every strand.