Nioxin system 2 treatment 3.4 ounce Nioxin system no.2 (formaly cytonutrient actives treatment) is an intense leave-in scalp treatment especially formulated for noticeably thinning is a daily scalp treatment to improve the appearance of thinning hair. Bioamp adds thickness from inside the cuticle and strengthens the hair shaft. Bionutrients and activ-renewal help provide a more youthful-looking scalp complexion. Unique scalp access delivery system helps protect nutrients as they moisturize and energize the scalp and hair. Nioxin scalp treament system no.2 contains SPF 15 to protect scalp skin from harmful UVA/UVB rays.