Shop › Calming Tonic 125ml Image 1 of 1 Calming Tonic 125ml £24.25 Soothes, gives comfort, hydratesCalming Tonic is a soothing treatment for sensitive scalps, giving relief to itching. Add To Cart Added! Soothes, gives comfort, hydratesCalming Tonic is a soothing treatment for sensitive scalps, giving relief to itching.