Some baking powder is made using cornstarch, while others are made with wheat starch. The baking powder is gluten free if this filler is cornstarch or wheat starch. Baking powder is made with baking soda, cream of tartar, and a starch.
Clabber girl baking powder is:
A sure way to make sure that you are not using commerical baking powder that has gluten in it. A baking recipe will usually call for 1 teaspoon of baking powder for every 1 cup or so of flour. I use this recipe all the time because my son cannot eat gluten. However, some brands contain aluminum, which has been linked to neurological diseases and reproductive problems in some people.