{"id":5702,"date":"2018-08-05T14:16:58","date_gmt":"2018-08-05T17:16:58","guid":{"rendered":"http:\/\/icaro.med.br\/?p=5702"},"modified":"2025-06-23T03:42:38","modified_gmt":"2025-06-23T06:42:38","slug":"thyroid-hormones","status":"publish","type":"post","link":"https:\/\/icaro.med.br\/en\/thyroid-hormones\/","title":{"rendered":"Mechanisms of action of Thyroid Hormones - TSH, T4, T3, reverse T3 and cia"},"content":{"rendered":"
\"\"<\/figure>\n\n\n\n

The image above is from the article \u201cMechanisms of action of thyroid hormones\u201d, available for free at: https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3433956\/<\/a>.<\/em><\/p>\n\n\n\n

<\/div>\n\n\n\n

Learn more about this extremely important gland, fundamental to life, here:<\/p>\n\n\n\n

<\/div>\n\n\n
\r\n
\r\n \r\n \"Thyroid\r\n <\/a>\r\n
\r\n Thyroid and its T3 (triiodothyronine) and T4 (thyroxine)<\/span>\r\n LEARN MORE<\/a>\r\n <\/div>\r\n <\/div>\r\n<\/div>\r\n \n\n\n
<\/div>\n\n\n\n

If you use (or know someone who uses) Levoid, Synthroid, Puran, Euthyrox and the like, read it (or show it to someone who does):<\/p>\n\n\n\n

1\ufe0f\u20e3 These are all trade names for levothyroxine sodium, whose only function in the body is basically the same as that of T4 (thyroxine): to be transformed into T3 (triiodothyronine). T4 itself has no recognized biological function: inside the cells, T4 has to be transformed into T3, which is the hormone that actually stimulates metabolism (find out more at https:\/\/icaro.med.br\/T3\/<\/a>).<\/p>\n\n\n\n

<\/div>\n\n\n
\r\n
\r\n \r\n \"T3\r\n <\/a>\r\n
\r\n T3 Hormone - What could be missing from your health?<\/span>\r\n LEARN MORE<\/a>\r\n <\/div>\r\n <\/div>\r\n<\/div>\r\n \n\n\n
<\/div>\n\n\n\n

2\ufe0f\u20e3 The problem is that for T4 to turn into T3, you need several conditions at the same time: sufficient quantity and quality of lifestyle habits (https:\/\/icaro.med.br\/15habitos\/<\/a>), vitamins (mainly D and B-complex), minerals (especially iron, selenium and zinc) and other hormones (such as progesterone, testosterone and low levels of leptin). In other words, many people are \u201ctaking T4\u201d (ingesting any of the drugs I mentioned above) and still have symptoms of hypothyroidism (https:\/\/icaro.med.br\/hipotireoidismo\/<\/a>), because T4 that isn't converted into T3 is practically \u201cuseless\u201d.<\/p>\n\n\n\n

3\ufe0f\u20e3 Even with the above conditions, in rare cases the patient can still produce T3, but face problems with the receptors for it. Just as each lock is opened by a specific key, each hormone has its own specific receptor. A hormone without free, quality receptors to receive it cannot act properly.<\/p>\n\n\n\n

4\ufe0f\u20e3 The excess T4 administered can still be converted into reverse T3, which is inactive and can \u201cclog\u201d the receptors, impairing the action of active T3.<\/p>\n\n\n\n

5\ufe0f\u20e3 T3 is so important that the thyroid produces around 15% of it, while the rest is T4. Therefore, those who no longer have a thyroid need to pay even more attention to the amount of circulating T3!<\/p>\n\n\n\n

6\ufe0f\u20e3 I see patients with \u201cthyroid problems\u201d almost every day, many of whom are poorly assessed and treated, unfortunately.<\/p>\n\n\n\n

Got it? If not, go to the links above and study. The videos and texts will help you!<\/strong><\/p>","protected":false},"excerpt":{"rendered":"

A imagem acima \u00e9 do artigo “Mecanismos de a\u00e7\u00e3o dos horm\u00f4nios da tireoide”, dispon\u00edvel gratuitamente em: https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3433956\/. Entenda melhor esta gl\u00e2ndula extremamente importante, fundamental \u00e0 vida, aqui: Se voc\u00ea usa (ou conhece algu\u00e9m que use) Levoid, Synthroid, Puran, Euthyrox e similares, leia (ou mostre para quem usa): 1\ufe0f\u20e3 Todos estes s\u00e3o nomes comerciais de levotiroxina […]<\/p>\n","protected":false},"author":1,"featured_media":24380,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[16,10,11],"tags":[],"class_list":["post-5702","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tireoide","category-doencas","category-hormonios"],"acf":[],"_links":{"self":[{"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/posts\/5702","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/comments?post=5702"}],"version-history":[{"count":4,"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/posts\/5702\/revisions"}],"predecessor-version":[{"id":24534,"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/posts\/5702\/revisions\/24534"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/media\/24380"}],"wp:attachment":[{"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/media?parent=5702"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/categories?post=5702"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/icaro.med.br\/en\/wp-json\/wp\/v2\/tags?post=5702"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}