Kate - here is a link from a forum I found that has a number of good links to browse as well one in particular that I have found helpful is good hormone health after seeing this iron supplement pop up from time to time, and there is a runner on this board (not hypo, just anemia problems) that was very pleased with Floradix - I've decided to try this to raise my own ferritn levels - I'm shooting for around 70. I just had my levels drawn this morning so I would know where I was starting from. I've been taking a multivit with iron for 4 months, but I don't think it has helped a great deal. This product is not supposed to have problems with nausea and constipation that so many other iron products seem to have. I would also advise against any time release iron supplement - we have to space iron supplements at least 2 hours ( I'm going with 4 hours) away from when you take your thyroid supplement. I have heard of people having interference with their thyroid doses when taking the time released products.