An ingredient I avoid is corn and just like gluten it’s used in a lot of products you may not realize. One of those products is baking powder.
Most companies add cornstarch to prolong shelf life and absorb moisture. For me it’s another thing I have to make myself but thankfully this is an easy one.
I use tapioca starch instead of cornstarch. I have found tapioca to be the starch my body can handle best. I still use sparingly. I use in a few cookie recipes and this baking powder recipe but otherwise I avoid starches. Corn, rice, and potato starch is so hard for me to break down and cause digestive blockage. The pain is not worth it to me.
1/4 C cream of tartar
2 T baking soda
2 t tapioca starch