Sorry, had to make two posts, first was too long, I guess to be accepted by MH.
Further, have a look at this statement from the site of the manufacturer of armour thyroid
, Forest Laboratories, Inc.
" armour thyroid
is a natural, porcine-derived thyroid
hormone replacement containing both T4and T3.
Note that the amount of thyroid
hormone in the thyroid
gland may vary from animal to animal.