America"s no. 1 trusted baking soda brand. The standard of purity. Hundreds of uses like: fresh box for baking. Since an open box of Baking Soda naturally absorbs unwanted smells and odors, always use a fresh, unopened box of Arm & Hammer Baking Soda to make the best tasting cookies and cakes! Each 1/2 teaspoon contains 616 mg sodium.