The physiological steps of thyroid hormones are generated predominantly by T3, nearly all of which (close to eighty%) is derived from T4 by deiodination in peripheral tissues. Synthetic T4 is equivalent in chemical framework for the T4 created from the human thyroid gland. Levothyroxine sodium has the molecular formulation C15H10I4NNaO4 https://torzondarkweb.com/product/fladrafinil-crl-40941/