<<Disclaimer: Verify this information before applying it to your situation.>> http://thyroid.about.com/b/a/125712.htm?nl=1 Found this interesting little piece on Mary Shomon's website. I'm a thyroid patient & have gotten some VERY GOOD advise from this website & Mary Shomon's book on hypothyroidism. ~Valerie in Tacoma Gluten Intolerance/Celiac Disease? Check Your Thyroid Drug Ingredients! November 13, 2004 Gluten Intolerance/Celiac Disease? Check Your Thyroid Drug Ingredients! "I purchased two of your books on hypothyroidism because I felt my thyroid treatment wasn't working as it had in the past. Your books prompted me to take the medicine more effectively and thus I got some relief. Based on your advice, I got a blood test and asked to switch from Unithroid to Synthroid--and felt even better but not great. An article on the connection between hypothyroidism and celiac disease prompted me to look up information on celiac disease. I had so many of the symptoms! I went on a gluten-free diet and the improvement is unbelievable in just one week. (I know it sounds like a commercial, but it is truly a miracle for me.) Celiac.com's list of forbidden substances mentions checking on the ingredients in prescription medicines. Turns out one of the ingredients in Unithroid is ultimately wheat-based--which is why I started deteriorating after switching from Levothroid to Unithroid. Synthroid is gluten-free. Also, I will likely have to adjust my dose with time as my recovering system is better able to absorb the medicine. Thought you might be able to help others with this information. Thanks so much for how you helped me. Jeane G." *Support summarization of posts, reply to the SENDER not the Celiac List *