Editing Hypothyroidism (section)

====Desiccated animal thyroid====
[[Desiccated thyroid extract]] is an animal-based thyroid gland extract,<ref name=Khandelwal2012/> most commonly from [[pig]]s. It is a combination therapy, containing forms of T<sub>4</sub> and T<sub>3</sub>.<ref name=Khandelwal2012/> It also contains [[calcitonin]] (a hormone produced in the thyroid gland involved in the regulation of calcium levels), T<sub>1</sub> and T<sub>2</sub>; these are not present in synthetic hormone medication.<ref>{{cite web |url=http://www.endocrinesociety.org.au/ESA_Position_Statement_%20Thyroid-Extract.pdf |title=ESA Position Statement on Desiccated Thyroid or Thyroid Extract |vauthors=Ebling PR |year=2011 |publisher=Endocrine Society of Australia |access-date=13 December 2013 |url-status=dead |archive-url=https://web.archive.org/web/20140126012359/http://endocrinesociety.org.au/ESA_Position_Statement_%20Thyroid-Extract.pdf |archive-date=26 January 2014 }}</ref> This extract was once a mainstream hypothyroidism treatment, but has been disregarded since the 1970s and its use is unsupported by evidence;<ref name=Chakera/><ref name=Khandelwal2012/> British Thyroid Association and American professional guidelines discourage its use,<ref name=Garber/><ref name=BTA2007/><ref name="ATA2014" /> as does NICE.<ref name=NICENG145/>