I assume you're taking T4. If it were being properly converted to T3, you would have a temperature of 37.0 C (98.6 F) in midday. You just aren't making enough T3.
As far as nutrition, everything is critical. But vitamin D and iron are especially so. I would suggest not fooling around, like I did; find a doc who can do a comprehensive nutritional evaluation in one fell swoop.
You might want to investigate wilsonstemperaturesyndrome.com .
My GP did the vitamin testing. He's a DO.
I've read that low iron, magnesium, B12, vitamin E, and B3 (niacin) could all be contributors to being cold. I had a full vitamin assay done and found that I was low in iron, B12, B3, Vitamin D, and Zinc. Settling those in addition to my thyroid has helped the coldness tremendously.
Not certain how to access vitamin tests rachel? will nhs Gp do that ? Im in Uk. Tsh is actually 0.05 but Im not hyper as one may expect with that - Gp explained that lots of hypo patients actually feel best at supressed level and I certainly seem to be one of those as I was much worse prior to treatment.
What deficiencies would lower your temp to this level??
Thanks for suggestions
Ali
If you TSH is around 1 maybe look at nutrition deficiencies through vitamin testing.