Why are synthetic thyroid hormones derived from pigs, or do they really come from some other source?

Dessicated thyroid extract made by Armour was derived from pig thyroid glands.
However most thyroid medication (thyroxine and others) immediately is a result of chemical synthesis.
The synthetic products are chemically identical to T4 and T3, the forms of thyroid hormone that are biologically helpful in humans.
synthetic thyroid hormones are made contained by the labs and ae chemicals. They do not come from pigs. What comes from oigs is Armour thyroid......a natural thyroid medication that's be around for years. I find the natural med to work much better because it contains T1, T2, T3, and T4, where on earth the synthetic meds are usually just T4.
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