We utilize All-Natural Baking Soda in our Original Formula Deodorant to naturally combat odor. Baking Soda has natural antibacterial properties and has an alkaline pH. In our Sensitive Skin Formula, we've replaced Baking Soda with Magnesium Hydroxide - a naturally occurring mineral with a gentle pH, it minimizes potential skin irritations and effectively neutralizes odor. This is a great option for those who react negatively to Baking Soda.