Maybe worth a dig:

direct link between CCP-owned Armour and pharmaceutical industry

I have a family member taking Armour thyroid medicine. Its made by Allergan but called Armour because it comes from Armour pig thyroids. According to family member, "some t4 hormones turn into t3, so synthetic thyroid medicine contains only t4 with the belief that the body will convert it to t3. However, some bodies do not convert it and require t3 & t4" and need the pig thyroid meds.