Infertility affects approximately one out of every six couples, according to the American Pregnancy Association. Although there are many reasons why a couple may be infertile, hormonal imbalances are one common cause.

If you have polycystic ovarian syndrome, or PCOS, your ovaries produce an excess of androgens--the group of male hormones that includes testosterone. Such an excess can lead to a number of troublesome symptoms, such as acne, excess body hair and fertility problems.

Hypothyroidism is more common in adults, but it can also occur in teens. With hypothyroidism, the thyroid gland in the front of the neck fails to produce enough thyroid hormones.

Growth hormone is a protein produced by the pituitary gland, which is a pea-sized gland located below the brain. Growth hormone is one of the hormones critical for normal growth in children and adolescents, and it is also involved in regulating metabolism. In adults, growth hormone deficiency is extremely rare.

According to the Drug Enforcement Administration, professional and recreational athletes illegally use performance-enhancing drugs to enhance their abilities and improve their physique. These substances, called anabolic androgenic steroids, alter the body's testosterone system.

Testosterone is a steroid sex hormone that plays a crucial role in maintaining a healthy libido in men and women. In men, the testes and the adrenal glands are the main providers of testosterone. The ovaries and adrenal glands produce the hormone in women.

Luteinizing hormone is a gonadotropin that stimulates the testes in men and the ovaries in women. Your anterior pituitary gland secretes this important hormone, which is vital to your reproductive health. LH is a large glycoprotein made up of alpha and beta subunits.

The pituitary gland plays an important role in regulating your sexuality and fertility. It synthesizes and releases a broad range of hormones that communicate signals from your brain to your body. Disease and time can break down this communication, according to a July 2008 review in "Aging Research Review."

If you have ever been under stress, you probably know that it has a negative effect on your body. But just how it affects your health is a matter of debate. Alternative health practitioners believe that chronic stress taxes the adrenal glands, creating a condition called adrenal fatigue or insufficiency.

Cortisol is a very important hormone, because it influences inflammation and plays a role in the stress response. The adrenal glands secrete this hormone into circulation four times per day. Its earliest and largest release, which occurs around 8 AM, effectively provides the energy to start the day.

Your body's metabolism depends on the amount of certain hormones in your body. The thyroid gland is located in the neck, and when active, it releases thyroid hormone that boosts the metabolism and also regulates body temperature.

Pearl cream, also called mother of pearl cream or concha de nacar, has a history that dates back to the Ming Dynasty of ancient China and Pre-Columbian cultures of the Inca Empire. NaturalWonders.