Re: What is "normal"?
OPtimal TSH for 95% of the populations is 0.89-1.1, basically as close to 1 as you can get. This is invalid if a person is on T3 supplementation or has pituitary dysfunction.
OPtimal T3 and T4 levels are dependent on age and sex. A female of child bearing age has an optimal range of 50-80% of the normal range. My MFM and OBs prefer 60-80% if you are trying for a child. NOW if you are menopausal or post menopausal your level requirements drop. Optimal range shifts to 40-70% of normal. Where is your optimal? Well that depends on your needs. What is optimal? Well it is where in the optimal range your levels are balanced AND your symptoms are negligible.
If we learn by our mistakes, I am working on one hell of an education.