thankyou to you both for the replies.
yep, i have heard about losing minerals through sweat but at the time i was also replacing those with supplements, but not the Iodine
(as i didnt know about the subject then)
i have been planning to get that detoxify or die book for a while now, but have got other books to get through first.
anyway, think i will lay off the sauna use till i get round to reading that book.
chardy- i wasnt sure which forum to post it in, i thought here suited better because it seemed to be debating whether sauna use could further increase hypothyroidims due to loss of iodine.