not sure how useful this is but seems interesting
article about selenium and its benefits for peo... - Thyroid UK
article about selenium and its benefits for people with borderline hashimoto
A word of caution to those choosing to supplement with selenium; doses of above 400ug per day have been shown to be toxic.
In the past, I have supplemented with 200ug when diagnosed with active Thyroid Eye Disease (as studies have shown it can help mild/ moderate cases if taken for 6 months). I then reduced to 100ug. Selenium supplementation did reduce my antibody levels (however, they still remain over range).
As Brazils can contain 50-90ug selenium each (depending on selenium content of soil where grown) it’s not advisable to take a selenium supplement AND eat a couple of Brazils a day.
Makes perfect sense in my circumstances. I still had in range TSH with FT4 at 5.5(12-22) and negative for both TPO and TGab antibodies at diagnosis of hypothyroidism. My selenium is naturally up-regulated (142.86% unsupplemented) due to a double CBS mutation which Izabella Wentz states causes hypothyroidism and causes you to lose B12 too quickly.