Steroids, according to TestCountry.org, were designed as a means of elevating testosterone levels considerably in the body while maintaining the effects of testosterone through synthetic materials intended to last much longer than natural testosterone produced by the body.

Eighty percent of U.S. cows are injected with hormones to increase their size, lean meat production and feed use efficacy. Although the European Union stopped buying U.S. meat in 1985 due to hormone use, the public opinion on its safety remains torn. U.S. cattle and sheep are fed, implanted or injected with hormones.

In competitive endurance sports such as cycling, increased levels of testosterone could offer several performance benefits. Unfortunately, the specific details of proper bike training to raise testosterone levels remains uncertain.

A hysterectomy causes immediate menopause due to the drastic reduction of estrogen, the female hormone for reproduction.

Steroid usage affects not only the body but the mind as well. The mental effects of using the drug can be just as dangerous and even more serious than the side effects that are physical.

There are several supplements that purport to block the production of estrogen in your body. The U.S. Food and Drug Administration, however, does not regulate claims made by supplement manufacturers.

Your thyroid gland functions to make hormones in your body. This gland is important in normalizing your metabolism, the process by which your body receives energy from the foods you eat. According to Medline Plus, millions of people in the U.S. experience thyroid disorders.

The thyroid gland, which is found in the neck, produces a hormone that keep cells healthy. When the thyroid isn’t able to produce enough of that hormone, a condition called hypothyroidism, doctors prescribe hormone replacement therapy.

TSH stands for thyroid-stimulating hormone. This hormone is produced by the pituitary gland, a small gland at the base of the brain, and starts a complex process that regulates endocrine function throughout the rest of the body.

The thyroid gland produces hormones that have various effects on the body. These hormones are called T3 and T4 for short, but T3 is the more actively available form and T4 is turned into T3 where necessary. At a normal level of production, the thyroid hormones help regulate many of the body's metabolic activities.

Transitioning from female to male is an individual experience, and no two transitions are alike. As part of the transitioning process, some people use testosterone injections to become more masculine. Some trans men will opt to undergo sex reassignment surgery, including removal of the breasts or genital surgery.

Testosterone, prolactin and estrogen are some of the many hormones produced in the male body. Of all of these hormones, testosterone is responsible for maintaining and expressing male features such as facial hair, body hair, sperm production and maintenance of muscles and bones.