If you have sensitive skin or do not want the harsh chemicals used in over the counter deodorant touching your body, make your own! Simply combine 2 tablespoons of cornstarch with 1 cup of baking soda. If you wish, you can add a few drops of your favorite essential oil for a scent. Then, dampen your skin. Using a clean makeup brush, apply this aluminum-free mixture to your armpits. The baking soda deodorizes while the cornstarch absorbs sweat.