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Testosterone

Welcome to Testosterones

This page is dedicated informing consumers about testosterone. Please use this page   as a portal for testosterone information.

Testosterone is the most important representative of the male sex hormones collectively called androgens.   Using cholesterol as a base, the male gonads (testes) produce between 4 and 10 mg of testosterone per day.   Testosterone itself is responsible for three major functions in animals.

1) The development of secondary male sex characteristics also called the androgenic functions of testosterone.   Some examples of these characteristics are increased growth of body hair, beard growth, deep voice, increased production of sebaceous glands, development of the penis, aggressiveness, sexual behavior, libido, and the maturation of sperm.

2) Promotion of the protein biosynthesis that are responsible for the highly anabolic characteristics of testosterone.   This is a pretty important function.   It accelerates muscle buildup, increases the formation of red blood cells, speeds up regeneration, and speeds up recovery time after injuries or illness.   It also stimulates the entire metabolism which results in the burning of bodyfat.

3) Inhibition of the gonad regulating cycle, including the hypothalamohypophysial testicular axis, which regulates the amount of testosterone produced in the organism.   If the testosterone level in the blood is high, the testes will signal the hypothalymus to release less LHRH (leutenizing hormone releasing hormone).   Thus the hypophysis releases less gonadotropin LH (leutenizing hormone) and FSH (folic stimulating hormone).   Consequently, the Leydig's cells in the testes reduces the production of testosterone.   In other words, if you have to much testosterone, your body will tell itself to reduce or even stop production of it until it is back down to its normal levels.

During puberty, testosterone levels are at their lifetime peak. They begin to decline around the age of 23. This is where testosterone therapy comes into play. Many men and women suffer from the lack of important hormones and replacement therapy is simply the most effective way to combat the signs of aging. Sex hormones like "Estrogen and progesterone profoundly affect the brain. The increasing memory loss and mild mental confusion emerging in middle age are largely due to declining levels of estrogen and progesterone in women. In men, these same problems are caused by decreasing testosterone and increasing estrogen levels beginning in the late thirties or early forties. Insomnia in women is also related to a lack of estrogen."                       

Male hormones

Control of Testosterone production

In both men and women, the hormones that control reproductive function are the same. The production of testosterone by the testis is controlled by the pituitary gland. This is a small gland (about the size of a grape) that sits at the bottom of the brain. It releases a number of messenger hormones that act as the "keys" to activate different organs in the body. These glands include the thyroid and the adrenals as well as the testes.

The pituitary gland produces luteinizing hormone (LH) and follicle stimulating hormone (FSH) which are the two important messengers for the function of the testes. The Leydig cells in the testis are controlled by LH to produce testosterone. FSH from the pituitary gland acts on the seminiferous tubules to make sperm.