Goldwell Dualsenses For Men Activating Scalp Tonic activates metabolic processes and blood circulation in the scalp, thereby improving the nutrition of the hair follicle. Hair becomes strong and resilient. The restorative action of the product accelerates the healing of minor damages. During use, a pleasant cooling sensation is felt, signaling the tonic's action. The tonic is adapted to all hair and skin types, ideal for daily use.