Hi @kellye5, I did a quick search through the CG discussion group and pulled together a few of the links that may be helpful to find in one place.

National Institutes of Health page on CG:
-- https://rarediseases.info.nih.gov/diseases/10961/collagenous-gastritis

Published studies/reports about CG; the first link is a case report from Mayo Clinic’s Department of Gastroenterology and Hepatology, Florida:
-– http://acgcasereports.gi.org/files/2017/05/CG-CGCR170035.pdf
-– https://www.wisconsinmedicalsociety.org/_WMS/publications/wmj/pdf/114/6/271.pdf

Clinical trial that includes collagenous gastritis at Mayo Clinic Rochester. Here is a link to the overview and contact information:
-- http://www.mayo.edu/research/clinical-trials/cls-20314533

More information at this post on Mayo Clinic Clinical Trials:
-- https://connect.mayoclinic.org/comment/70175/bookmark/?ajax_hook=action&_wpnonce=b6b5c1b941

How The Gut Microbiota Affects Our Health with Dr. Erica & Dr. Justin Sonnenburg
-- https://youtu.be/gOZcbNw7sng

Hoping you find some answers soon.

John

Thanks so much....I am very grateful!

Thanks John! Helpful links!