MY GP said they could do no more for me when they concluded I probably needed T3 in addition to my T4. I got a private referral and following further blood tests I now have a prescription from that consultant for 25mg Liothyronine. He said I'm not converting my T4 to T3. He also said this was cheaper to buy online. I went to Boots who said it will cost me £100 and they only do 20mg tablets and can't get the 25 mg. I can't find a supplier online! Can anyone on here help me with a website address?