Definition of Thyroxin:

T4, or thyroxine, is a hormone produced by the thyroid gland to help control metabolism and growth.  It is also prepared synthetically for treatment of hypothyroidism and myxedema.  Laboratories commonly measure Total T4, which reflects the total amount of T4 present in the blood, both unavailable and free; Free T4 reflects the amount of biologically active T4.  Synthroid (Levothyroxine) is a synthetic form of thyroxine.

Also: Free T4, L-thyroxine, Synthroid, Thyroxine, Total T4

Topics Related to Thyroxin

Hives (Urticaria)

...relationship to Chronic Thyroiditis
“...In a study of 10 patients with chronic hives, thyroxine (T4) was administered for a minimum of 12 weeks...”
...recommendation Thyroid Medications
“A study suggests that administration of thyroxine to patients with chronic urticaria associated with elevated thyroid antibodies can result in remission of the hives...”
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More topics Related to Thyroxin


...related topic
“...include adrenal hormones such as corticosteroids and aldosterone; glucagon, growth hormone, insulin, testosterone, estrogens, progestins, progesterone, DHEA, melatonin, and thyroid hormones such as thyroxine and calcitonin.”


...the condition
“...patient receives glucose load; diabetes occurs in 30% of cases; elevated IGF-1; elevated prolactin level; elevated liver function; elevated blood urea nitrogen; elevated phosphorus; decreased free thyroxine; elevated thyroid stimulating hormone) and through imaging (MRI shows pituitary tumor)...”


...recommendation Selenium
“...It appears that taking selenium without iodine will result in a decrease in production of Thyroxine (T4), although there may be an initial transient increase in T4 to T3 conversion and hence higher T3 and seemingly worse hyperthyroidism.”


...the condition
“...Replacement therapy consists of a either T4 (thyroxine) and/or T3 (triiodothyronine)...”
...our question about Your Total T4 level
“When TSH and Total T4 are both low, a poorly-functioning pituitary gland is suspected.”


...the condition
“...It occurs when the thyroid gland fails to produce or secrete as much thyroxine (T4) and triiodothyronine (T3) as the body needs...”

Immune System Imbalance (TH2 Dominance)

...recommendation Thyroid Medications
Thyroxine (T4) found in Synthroid and desiccated thyroid is a thyroid hormone that increases TH1 cytokines to help balance the immune system...”
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More topics Related to Thyroxin


...related topic
“A essential mineral that is an integral part of the thyroid hormones, thyroxin and triiodothyronine which have important metabolic roles and govern basal metabolism...”

Manganese a treatment
“...Manganese is ... Involved in the formation of thyroxin in the thyroid gland...”

T4 only

...related topic
“Examples of T4-only thyroid hormone replacements include: Synthroid, Thyroxine, Eltroxin, Levoxyl, Unithroid or Levothyroxine.”


...related topic
“...It is converted into circulating thyroxines when the thyroid is stimulated by TSH (Thyroid Stimulating Hormone) from the pituitary (in turn stimulated by the hypothalamus, where thyroxine levels are actually monitored)...”


...related topic
“...To a high degree, metabolism is regulated by the hormone thyroxine, which can be made by the thyroid if enough organic iodine is available...”

Thyroid Medications a treatment
“...The synthetic thyroid hormone, Synthroid (T4) is commonly prescribed by many physicians when thyroid tests are abnormal and in many cases doesn't seem to work as effectively as expected...”

Vitamin A Toxicity

...the condition
“...Thyroxine, zinc and vitamin E enhance the conversion of carotene to vitamin A...”

Vitamin B3 Requirement

...the condition
“...Vitamin B3 is necessary for the manufacture of the hormones cortisone, thyroxine, insulin, and the sex hormones estrogen, progesterone, and testosterone...”
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