Salt of the earth natural deo crystal is made purely from potassium alum a natural antibacterial mineral salt that has been used for odour protection for hundreds of years this deo crystal works by leaving a thin layer of natural mineral salts on your skin these mineral salts are a natural deodorant and inhibit the formation of body odour on your skin providing you with long lasting protection unisex fragrance free long lasting protection suitable for vegetarians and vegans not tested on a