Testosterone is a male hormone that is common to every mammal and not to humans only. It is very vital for sexual functioning and health for both men and women. It is secreted primarily in the ovaries for women and in the testes for males and it would also be secreted by the adrenal glands in small amounts.

Low testosterone levels can be treated through testosterone therapy; however, not all individuals with low testosterone should go through such therapy. For aging men, it is much better to take the supplemental testosterone.

There are benefits and risks when you go through testosterone therapy. It would be much better to consult the doctor and specialist before having such. There are several facts that you should know about testosterone; here are some facts that you must know about it.

• Testosterone levels would be decreasing as the age is increasing. Testosterone levels are very high and at their peak during early adulthood and also during the adolescent and teenage years. For most individuals, their production of testosterone would decline at the age of 40. According to research and studies, a 40 year old man has ½ less testosterone as compared to a 25 year old individual.

• Testosterones are produced in the testicles but it is controlled by the brain. The first signal would come from the hypothalamus.

• Testosterone levels could be measured through a blood test. A simple blood test could measure the free testosterone that is circulating around your blood. There are also several symptoms that could confirm your testosterone level.

• Low libido or low sex drive and erectile dysfunction are some of the symptoms of having low testosterone levels. It is a common problem for aging men. There are however several ways to increase a certain individual's sex drive. In this modern age, geniuses have come up with several ways to increase the sexual urges of a certain person.

• Depression for older men is caused by low testosterone level. That is why several older men are constantly depressed and grumpy for older men have lower testosterone levels. Lower testosterone could also enable mood changes.

• Testosterone is the most vital hormone for body builders and fitness fanatics for it is also connected with muscle mass, bone density, immune system function, neurological function and heart function. For some body builders they would use illegal drugs such as steroids to increase their levels of testosterone.

• Low levels of testosterone can cause deaths for men over the age of 50. It has been proven and tested by several researchers.

• For women, the testosterone levels would decline during the menopause stage. The women's ovaries would no longer release eggs during the menopause periods. The production of testosterone would also decline but it is much lesser as compared to the progesterone and estrogen changes.

• There are several risk and side effects that can be caused by testosterone therapy. Side effects include baldness, breast enlargement, bad skin reactions, less sperm production and testicle shrinkage. So consult first your doctor before proceeding. Testosterone supplements might be the better solution for you as compared to the testosterone therapy.