Our natural deodorant for children, the Rock Chick Crystal Deodorant Stick, is ideal for those who have reached puberty early and are starting to notice changes in body odour. Just One Ingredient - This alum stone is crafted from only potassium alum, a naturally occurring mineral salt. This crystal deodorant sits lightly on the skin creating a protective layer that helps to effectively neutralise the growth of odour-causing bacteria without clogging pores.