Testosterone is a steroid hormone from the androgen group. In mammals, testosterone is primarily secreted in the testes of males and the ovaries of females, although small amounts are also secreted by the adrenal glands. It is the principal male sex hormone and an anabolic steroid. Testosterone is evolutionarily conserved through most vertebrates, although fish make a slightly different form called 11-ketotestosterone.[1]

In men, testosterone plays a key role in health and well-being as well as preventing osteoporosis. On average, an adult human male body produces about forty to sixty times more testosterone than an adult human female body, but females are, from a behavioral perspective (rather than from an anatomical or biological perspective), more sensitive to the hormone.[2] However, the overall ranges for male and female are very wide, such that the ranges actually overlap at the low end and high end respectively.

In general, androgens promote protein synthesis and growth of those tissues with androgen receptors. Testosterone effects can be classified as virilizing and anabolic, although the distinction is somewhat artificial, as many of the effects can be considered both. Testosterone is anabolic, meaning it builds up bone and muscle mass.

• Anabolic effects include growth of muscle mass and strength, increased bone density and strength, and stimulation of linear growth and bone maturation.
• Androgenic effects include maturation of the sex organs, particularly the penis and the formation of the scrotum in the fetus, and after birth (usually at puberty) a deepening of the voice, growth of the beard and axillary hair. Many of these fall into the category of male secondary sex characteristics.

Testosterone effects can also be classified by the age of usual occurrence. For postnatal effects in both males and females, these are mostly dependent on the levels and duration of circulating free testosterone.

Source: WIKIPEDIA: www.en.wikipedia.org/wiki/Testosterone

Women produce far less testosterone than men, approximately one-seventh the amount each day. This small quantity of testosterone circulating in the female body is essential for normal sexual development before, during, and after menopause. As a woman ages, she will naturally produce less testosterone. This decline is most severe during menopause, with levels diminishing to merely half of what they were before menopause.

Testosterone is essential for the general health and sexual functioning of the female body. It is vital for a woman approaching menopause to be aware of her testosterone levels.

Testosterone's effects can be categorized into three areas: physical, sexual, and psychological.

Physical	Testosterone stimulates development of muscle, bone, skin, hair growth and sex organs.
Sexual	Testosterone enhances a woman's libido. As a key player in a woman's sex drive, it affects interest, arousal, sexual response, lubrication and orgasm.
Psychological	Testosterone impacts a woman's moods. It improves mental power, by enhancing visual and perceptual skills.

Source: NATURAL HORMONES: http://www.natural-hormones.net/testosterone.htm

Testosterone Hormone (TH):

• Enhances sex drive
• Builds muscle
• Elevates mood
• Prevents osteoporosis
• Improves memory
• Lower cholesterol
• Protects against heart disease
• Reduces urinary obstruction from the prostate gland
• Decreases fasting blood glucose, plasma cholesterol, and triglycerides
• Decreases diastolic blood pressure
• Decreases visceral adipose tissue (organ fat)