Goldwell Dualsenses Men Tonic Activating Scalp Tonic For All Hair Types5 Ounce 150 Gram This stimulates the blood circulation of the scalp. This tonic gives a cooling effect and enlivens the hair roots. This strengthens the hair and gives the hair noticeably more energy. It has a wonderful scent and is very economical. The specially developed recharge system with guarana caffeine complex ensures visibly healthy, strong hair and noticeably more energy.