Biork crystal deodorant is a sustainable roll-on plastic free deodorant. Perfect for a zero waste lifestyle. People have been using potassium crystal since antiquity. It is particularly favoured in Asia where it is used as a natural antibacterial agent and deodorant. Potassium crystal is a mineral compound made up of alum and potassium crystals - a completely natural product. Sweating is a natural bodily function that regulates body temperature. Many bacteria find sweat zones to be the perfect environment in which to multiply. These bacteria are responsible for unpleasant odour. Biork crystal deodorant slows the production of bacteria and prevents the build-up of unpleasant odours. It lets the skin breath and perspire naturally. This is a natural anti-bacterial product, perfect for all types of skin – even the most sensitive.