16 Nov 08 What is testosterone?
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Testosterone is a substance produced in the testes and in the adrenal glands that helps to build protein and is essential for normal sexual behaviour and the development of masculine characteristics such as a deep voice, broad shoulders, and hair growth.
It also affects many metabolic activities, such as production of blood cells in the bone marrow, bone formation, fat metabolism, carbohydrate metabolism, liver function and prostate gland growth. Additionally, normal testosterone levels maintain energy level, good mood, fertility and sexual desire
Low testosterone levels are typically defined as less than 300ng/dL (nanograms per decilitre) of total testosterone and less than 5ng/dL of free testosterone.
