3,3’,5-Triiodo-L-thyronine Dehydroxy Methylamide-d3 is the isotope labelled analog of 3,3’,5-Triiodo-L-thyronine Dehydroxy Methylamide (T795400); an analog of 3,3’,5-Triiodo-L-thyronine (T795380) which is one of the hormones produced by the thyroid gland that is involved in the maintenance of metabolic homeostasis. Also produced in peripheral tissues as the active metabolite of Thyroxine (T425601).