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Yes. Testosterone is the most important of the male hormones. (The ovaries produce it in lower levels in women.)
It is responsible for muscle, bone and sexual development as well as sex drive. At puberty, it makes makes the voice drop and the penis, testicles and facial and pubic hair grow.
Testosterone levels fall slightly with age. Some men - particularly those with high levels to begin with - can effectively have half as much testosterone in their blood at 80 as at 20. It may lead to loss of muscle tone and bone strength and an increase in weight and the risk of heart disease and diabetes.
Whether reduced testosterone is also the cause of the sluggishness, loss of libido and depression that some middle-aged men experience is debateable but it is worth thinking about. Testosterone replacement therapy is available but, while trials continue, many doctors are sceptical.
Yes. Taking more exercise and having more sex gets the hormones going. Also fat reduces the amount of testosterone available to the body so losing weight and cutting down on fatty foods and beer may help.
Vitamin and mineral deficiencies can worsen hormonal problems. Eat more seeds (particularly pumpkin and sunflower seeds), shellfish, beans, yoghurt and lean meat. These are high in zinc - the mineral essential for testosterone production. Ginseng, stinging nettles and the South American herb Muira Puama are also reputed to help.
Testosterone makes you a man but it's also what makes a woman a woman. Testosterone is the main male hormone but, as the precursor to the female hormone oestrogen, it's essential to women too.
Myth. Women are driven by testosterone just like men. Researchers revealed a new spray that was doing wonders for Australian women with low sex-drives. The active ingredient? Testosterone. An effective treatment for women with low libidos could be worth $1 billion.
Testosterone is broken down into dihydro-testosterone (which causes baldness) in the prostate, an organ which women don't have.
No, you're OK. I mean, he's OK. Testosterone levels fall slightly with age but they're very rarely the cause of erectile dysfunction.
As we said, some men have effectively half as much testosterone in their blood at 80 as at 20. It may reduce muscle and bone strength and increase weight and the risk of heart disease and diabetes.
No. Unless you have been prescribed them by a doctor, testosterone replacement therapy (TRT) can be very dangerous. The Food and Drug Administration (FDA) in the USA found that men who took TRT were at increased risk of heart attacks. Sometimes a doctor may feel it is necessary to increase your level of testosterone. This is the case in some conditions such as Hypogonadism where your body isn't producing enough testosterone and also Klinefelter's syndrome. When presribed men are given Testosterone enantate which acts very similarly to the testosterone we make in our bodies.
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Date of last review 07/04/14
Date of next review 07/04/17
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