How important is having a decent FT4

cb2

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I have been dabbling with natural thyroid for a couple years. many years ago i had an RT3 problem..but that seems to be ok know. maybe the HC has helped conversion i am not sure.

anyway with nature throid at 3 grains I have about mid range ft3 but really low Ft4. there are 2 schools of thought on this .
1 you need more ft4 for brain function
2. you don't need ft4 only ft3.

so i am in a quandary as to what to do.. i have considered adding some T4.. or increasing the Nature throid to see if i can get more of both- but i have gotten 2 different opinions from dr's and not sure what to do.

any thoughts? thank you