There are many posts advising being tested for Ferritin, folate, B12, Calcium, Vit d3, Magnesium & zinc. I'm presuming ferritin is iron? I get confused between ferritin, folate and zinc? My main question is - I would appreciate some guidelines (I know they vary a bit around the country) as to what optimum level each mineral or hormone level should be at to keep the thyroid in good condition and help with Hashimoto's. Thank you.