Great leave-in scalp tonic for all hair types that reduces dandruff and itching on the scalp. No. T Climbazole Scalp Tonic from System 4 is designed for daily use and nourishes the scalp to prevent dandruff and itching. It dissolves excess sebum and stimulates blood circulation. This means that you experience new and healthy hair growth and the scalp is free of dandruff and grease. The product does not need to be rinsed out and therefore works all day with the hair and scalp, leaving hair healthy and beautiful. No. T Climbazole Scalp Tonic from System 4 is dermatologically tested and has a pH value of 3.5.