I recently had a terrible reaction to cinnamon gum that blistered the inside of my mouth so badly that I ended up in the ER. In the past I've had canker sores from using cinnamon toothpaste, but nothing like what the gum did to me.
I did a little checking and the gum is made with cinnamon oil. I've never had a reaction from eating cereals with cinnamon but a nurse friend said I should avoid it completely from now on because I could have an anaphylactic reaction in the future and honestly I'm scared to have anything with it right now. It was a week of pure agony.
Should I avoid all cinnamon products now? I'll sure miss my Dr. Peppers.