Baking soda is a natural particle that dissolves while cleansing the skin or in bath water. It is a natural alkaline that neutralizes acids and washes away oils and dirt. It’s natural pH balance leaves the skin soft, silky and smooth. It is great to use in soaps, bath salts, and skin scrubs. When mixed in appropriate amounts with citric acid, it produces a chemical reaction that leads to the fizz in bath fizzies. All Natural.