Nioxin System 2 Treatment 3.4oz Nioxin System #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 #2 contains SPF 15 to protect scalp skin from harmful UVA/UVB rays.