Aluminum is an element that has been proven to harm the body. Internal consumption has been linked to breast cancer, Alzheimer's, and kidney problems. The most common place where we intake aluminum is in our drinking water. Cooking in Aluminum pots and pans is also not recommended because the aluminum is transfered from the cooking vessel to the food. Aluminum toxicity is also well known in the food preparation business. In particular, breweries take care not to brew their beverages in aluminum containers. It doesn't just influence our food preparation, it also appears in anti-perspirants and deodorants. The aluminum in deodorants lodges itself in the pores and absorbs the sweat naturally produced by our body. While it does not permeate the skin, it clogs the pores in an area that is dangerously close to important underarm lymph nodes. I recommend using a natural deodorant crystal made from either ammonium allum, or potassium allum.