A lot of men on testosterone can have low testosterone because of a combination of lifestyle and genetics. The reason for this is because testosterone levels are very dependent on the amount of testosterone in the blood. If you get a lot of testosterone, you have a very high testosterone, and if you don't get a lot, you don't have that high level of testosterone. For most people, they get their testosterone from a large, low-dose testosterone pill every day, which also provides a lot of other hormones to the body. Testosterone, or free testosterone, is produced in the liver when it's converted to the active androgen, testosterone. This is the same hormone as cortisol, another hormone that affects the body's sleep and metabolism. The production of this hormone by the liver also affects the function of other hormones such as growth hormone and cortisol in the body, which is why it is also important for people with low testosterone to take a high dose of cortisol in order to increase the amount of testosterone in the body. Testosterone also plays a role in energy metabolism and metabolism of fat cells. This hormone also has several other effects on the body, such as strengthening the immune system, improving bone health, and even reducing the risk of certain cancers.