A solid deodorant bar that glides beautifully. Aluminium free and baking soda free. Magnesium Hydroxide is one of the the star ingredients in our bars. We use this as an alternative to aluminum, baking soda and other ingredients that are potentially irritating, ineffective, or hazardous. Magnesium Hydroxide does not absorb into the skin. Instead, its main purpose in a natural deodorant is to reign in both moisture and odor-causing bacteria. It counteracts any odor-causing bacteria on the surface of the skin without impacting the dermis – the layer of skin where sweat glands, pores and hair follicles are contained.