Hi everyone, I'm new here since my TSH has started to rise after being on levothyroxine for about 8 years. My GP has increased my dose from 100mcg to 112.5mcg as my TSH has gone from normally around 2 (for the past 8 years) to 4.47 and then to 6.7 a month later in January. All my vitamins are within normal range but Ive been reading on this website that they need to be "optimal" vs "normal". Are my levels at an optimal level and if not, could that be affecting my thyroid? Here are the results from December blood test:
Serum vitamin D 60 nmol/L (50-174)
Serum folate 13.9 (no range given)
Serum vitamin B12 419 (190-660)
Serum ferritin 52ug/L (13-150)
Free T4 18.2 pmol/L (10.8-25.5)
I'm not sure if I need to supplement any of these to help thyroid function.