Fasting and Thyroid Function: Why Active T3 Drops and What Reverse T3 Means
A drop in active T3 during fasting is often mistaken for hypothyroidism, but shifting T4 to reverse T3 is an adaptive energy-preservation mechanism.
Thyroid
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Thyroid: Why TSH Alone Misses Most of the Problem
One number is used to rule the whole system in or out, and it sits two steps upstream of anything you would actually feel.
Selenium: A Narrow Window and Two Important Jobs
Required to activate thyroid hormone and to run the body's own antioxidant system — with a therapeutic range tighter than most minerals.