Blurg - Synthroid - Need Advice. in Coping with Celiac Disease Posted April 16, 2015 · Report to Admin I take synthroid (50 mcg) and have never had a problem with it. I think there's a high prevalence of hypothyroid and celiac (but I could be wrong). I know some people with Hashimotos that do better on a gluten free diet. Good luck to you!