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Celiac Disease Foundation: An amazing place to take part in learning, advocacy, and more! This is active nationally throughout the US.
National Celiac Association: This is the organization that started The Gluten-Free Food Program.
Gluten Intolerance Group: They developed the program that reviews companies and hands out certified gluten free verifications to certain foods.
I'm not a medical professional, but these are some resources I hope you might find helpful!