Been trolling through a couple of websites re thyroid issues etc. Came across this paragraph. I thought I had read conversion occurred mostly if not all in the liver.
“Without a thyroid, the body cannot produce the critical thyroid hormones T4 and T3. Furthermore, conversion of T4 into T3 primarily takes place in the thyroid (conversion can occur in the peripheral tissues but it is not nearly as efficient). Without a thyroid gland, one will almost assuredly be T3 deficient. For this reason, it is important for hypothyroid patients without a thyroid to be prescribed treatments that include T3 in addition to T4.”