<<Disclaimer: Verify this information before applying it to your situation.>> I forgot to tell you that since xanthan gum is a corn product derivitive, if you are allergic to corn you will react. Also, if you are allergic to yeast/mold, the corn is fermented during the process to make the gum, so you will react. I have both these allergies, so that is probably why I had this reaction. Rosalie(NJ)