NIOXIN Scalp Treatment- System 2 (100ml) with SPF 15 sunscreen protects the scalp skin from harmful UVA and UVB rays; while delivering essential botanicals, nutrients, antioxidants and cytokines (proteins) onto the scalp skin and hair to help safeguard against environmental residue and DHT build-up on the scalp. NIOXIN Scalp Treatment- System 2 (100ml) may cause temporary redness after application.