Thanks to Treepie for directing me to Isabella Wentz's site, her language is so clear and easy to read I've ordered her book Root Cause. I would like to try to improve my condition with diet, vitamins & supplements, (posted test results in earlier post but only had TPO, TSH and FT4 done). I think I should start with having private blood tests. Apart from Vit B12, vit D, folate & ferritin are there others tests I should include? I take no medication and only vit D yg 25. Losing confidence in GP, far more knowledgeable folk here.