Nioxin Scalp Therapy System 4 - for fine chemically enhanced hair in the noticeably thinning stages of hair loss - is a deep conditioner that moisturizes and energizes the scalp. BioAMP adds thickness from inside the cuticle and strengthens the hair shaft. Bionutrients and Glyco-Fused Complex, a proprietary infusion of herbs and botanicals, safeguard the scalp from the drying irritation caused by chemical services.