Vasso refreshing hair tonic hydra boost effect (cool fresh) 230 ml vasso refreshing hair tonic provides balance for your hair due to its developed content. the multivitamin structure helps to nurture your scalp. how to use 1-apply and massage vigorously to stimulate and cleanse the scalp. 2-massaging helps the stimulate circulation to the scalp, promoting scalp health , while the tonic moisturizes the hair and scalp.