Estrogen is a female sex hormone that is responsible for many developmental, as well as other, functions in the body. It is balanced by the hormone progesterone during menstrual periods.

According to an article in "The New York Times," the existence of testosterone, a male hormone consisting of natural steroids, was first discovered in 1935. Testosterone levels in most men average between 260 nanograms and 1,000 nanograms per deciliter of blood plasma. But that measurement is not constant.

Progesterone is the precursor to many hormones, including testosterone, the sex hormone that emphasizes male characteristics, and estrogen, the sex hormone that emphasizes female characteristics.

The camphor tree is a large evergreen that grows in Florida, California, South America and Asia and is widely known for its turpentine-like smell, traditionally used in making mothballs. Camphor oils and herbs must be used topically and can be toxic when ingested.

Exercise is supposed to make your body healthier and make you feel better, but there are times when you finish a workout and feel clammy and nauseous. This is due to a number of factors, all of which can make fitness an unpleasant experience.

Testosterone is the primary androgen or male sex hormone; according to a 2001 "Endocrinology: An Integrated Approach" article, 95 percent of circulating testosterone is produced by the testes. Testosterone is also found in females but in much lesser concentrations.

Estrogen is the female hormone that plays a role in various functions throughout the body. For women, estrogen helps maintain female features and is vital to your body's fertility. Estrogen also influences your mood and helps maintain your sexual organs.

Progesterone is a hormone that helps maintain the uterine lining in preparation for a pregnancy. Birth control pills, hormone replacement therapy and pills to regulate menstrual cycles often contain a synthetic form of progesterone.

If you've considered buying over-the-counter bovine or herbal thyroid supplements, you might wonder how they differ from the synthetic thyroid hormones prescribed by physicians. Like synthetic thyroid therapy, bovine supplements replace hormones.

Human growth hormone, HGH, affects development and healing. Younger children with low growth hormone levels typically fail to reach normal height and weight. Older adults with HGH deficiency often have difficulty maintaining body weight and bone density.

Progesterone plays an important role in the health of women. This hormone regulates menstruation, supports pregnancy and alters fertility. Progesterone also affects men. It changes testosterone level and impacts sperm count.

Adrenaline, or epinephrine, and cortisol, or hydrocortisone, are stress hormones secreted from the adrenal glands, which sit above the kidneys. Though both chemicals are stress hormones, adrenaline and cortisol play different biochemical roles. Adrenaline primarily binds to receptors on the heart and heart vessels.