Is allergy to baking powder possible?

I posted 2 weeks ago about a reaction to an unknown contaminant while eating homemade pancakes. I decided that perhaps my son was allergic to cinnamon as all the other ingredients were quite basic and things he eats all the time (flour, brown sugar etc) and this recipe called for quite a bit of cinnamon. Anyhow, I made the same pancakes today but left out the cinnamon. He ate one then asked for a second one, and then he said , my tongue is itchy and it's that white stuff that bothers me. Other than the "itchy tongue" he reported there was no blotchiness on his face like the other time. Has anyone ever heard of an allergy to baking powder or did he just eat a little lump of it and hate the bitter taste? As recipes go it did call for a lot of baking powder-1 tablespoon.

Blackmoss-Thanks for the info. Another question-what does baking powder "do" to the food? Can I just omit it?

Baking powder is a leavening agent. It is responsible for a light, fluffy texture. Sometimes it can be eliminated, but you will get a denser texture.

Is your child allergic to eggs as well as N/PA? Baking Powder can contain egg ingredients. I've never tried the baking powder substitute in this thread, but it's probably worth a try. My son is allergic to eggs and nuts/peanuts and we can use "Blue Ribbon" and "Magic" brands from Canada without a problem.
It's possible to be allergic to one or more ingredients in baking powder.
This can be used as a substitute (if not allergic to these ingredients):
Baking Soda 1 part
Cream of Tartar 2 parts
Ground brown rice or rice flour 1 part
So for a tablespoon it would be:
3/4 tsp baking soda
1-1/2 tsp cream of tartar
3/4 tsp ground brown rice
[This message has been edited by blackmoss (edited March 23, 2001).]