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L-Tyrosine
Thyroxine, also tetraiodothyronine (T4), is the main hormone (see Hormone) secreted by the thyroid gland. The function of this and the other thyroid hormone, triiodothyronine (T3), is to increase the cellular rate of carbohydrate metabolism and of protein synthesis and breakdown.
L-Tyrosine is a precursor to the neurotransmitters dopamine, norepinephrine and epinephrine, and to enkephalins (special peptides that subdue messages of physical discomfort such as pain.) Sufficient dopamine is absolutely essential to a healthy sex life and can be stimulated by the drug, Apomorphine HCL which is the main ingredient of the sexual dysfunction drug, Uprima. Both synthesis and secretion are regulated by, and in turn regulate the formation of, a hormone secreted by the pituitary gland. Thyroxine was first isolated in 1919 by the American biochemist Edward Calvin Kendall and was synthesized in 1927 by the British biochemist Charles Harington. Synthetic thyroxine is now used in treating thyroid-deficiency conditions such as cretinism and goiter.
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