thyroxin

is thyroxin that risky to use pre contest and can u use epherdrine as well :afro:

L thyroxin is the the weaker of the two hormones in the thyroid. (t4)
Cytomel t3 is much stronger and is normally used during contest prep but for a shorter period of time. It would not be wise to use epherdrine
while on any thyroid drug.

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Ironman

The thyroid gland secretes three hormones:

Thyroxine or 3:5,3':5' tetra*iodothyronine (T4) is the major hormone secreted by the follicular cells of the thyroid gland. With 99.95% of the secreted T4 being protein bound, principally to thyroxine*binding globulin (TBG), to a lesser extent thyroxine binding pre*albumin (TBPA) and albumin. T4 is involved in controlling the rate of metabolic processes in the body and influencing physical development.

3:5,3' tri*iodothyronine (T3) is 3*4 times more potent than T4. Only 15% of the total normal T3 concentration is directly secreted by the follicular cells. With 99.5% of the secreted T3 being bound to the same proteins as T4.

Calcitonin is secreted by the C*cells of the thyroid gland. Its function is totally unrelated to the other thyroid hormones, since it's involved in calcium homoeostasis.
T4 (either total or free) along with thyroid stimulating hormone (TSH) are used as biochemical indicators of thyroid function,which aids the diagnosis and monitoring of either hyperthyroidism or hypothyroidism.

(thrk´sn) (KEY) , substance secreted by the thyroid gland. The hormone thyroxine forms by combining the amino acid tyrosine with iodine. Complexed to a protein, it is stored in the follicle stems between thyroid cells. Thyroxine enters into the bloodstream complexed to another protein, plasma globulin. Thyroxine increases the number and activity of mitochondria in cells by binding to the cells’ DNA, increasing the basal metabolic rate. Administration of thyroid hormones, such as thyroxine, causes an increase in the rate of carbohydrate metabolism and a rise in the rate of protein synthesis and breakdown. The hormone, which excites the nervous system and leads to increased activity of the endocrine system, remains active in the body for more than a month. Thyroxine activity is controlled by thyrotropin, a substance released from the pituitary gland. Conversely, thyroxine regulates the effect of thyrotropin by feedback inhibition, i.e., high levels of thyroxine depress the rate of thyrotropin secretion. Synthetically prepared thyroxine is used clinically in the treatment of thyroid gland deficiency diseases in adults and in the treatment of cretinism in children.