Jerrie, I have the exact same experience. Looking at my recipes, I thought it must be xanthan gum. I figured it out by baking two loaves of bread, one with xanthan gum, one with a gluten substitute that doesn't contain xanthan gum. The heartburn was clearly present with the loaf made with xanthan gum and not present with the other loaf. The gluten substitute is by a brand called Orgran. It's such a relief because I cannot tolerate any wheat/gluten and I certainly didn't want to live with heartburn either! Hope it helps :)

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