Estrogen is the primary female sex hormone and plays an important role throughout a woman's life. In teens, estrogen contributes to healthy bone growth and development and influences reproductive processes such as menses and fertility.

Prolactin is a hormone produced by the anterior pituitary gland and is responsible for breast changes during pregnancy and lactation following delivery. High prolactin, also called hyperprolactinemia, happens when the pituitary gland secretes too much prolactin.

Estrogen is a steroid hormone produced by the ovaries in women and in small amounts in the testes in men, as well as in fat cells for both sexes.

When your thyroid gland is unable to produce enough thyroid hormone, you have a condition called hypothyroidism. Hypothyroidism is more common in females than males, and the risk increases with age, according to the National Institutes of Health. Thyroid hormones regulate your body metabolism.

Estrogen and testosterone are found in both men and women, in different concentrations. An imbalance of one or both of these hormones can have significant physical and psychological consequences and can be caused by illness, medications, tumors or, occasionally, genetic predisposition.

Dopamine is a neurotransmitter, a chemical that facilitates transmission of signals between brain cells, or neurons, by binding to neuron receptors. The chemical is involved in controlling emotions, pleasure, movement and incoming information. The chemical is also sometimes called the "reward hormone,"

An estimated 25 percent of men begin balding by the age of 30, explains MedlinePlus, a service of the National Institutes of Health. Baldness generally is related to aging, heredity and testosterone.

Estrogen is a female hormone that plays a main role in maintaining female sex characteristics and monthly menstrual cycles. Estrogen levels usually drop at the time of menopause, but can also drop if ovaries are removed or in certain disease processes.

Cortisol is a steroid hormone produced by the adrenal cortex. Cortisol is mainly released in response to stress. Mild elevations of cortisol rarely produce recognizable symptoms.

There are many hormone creams on the market that promise weight loss. The most common hormonal cream available for weight loss as of 2010 is progesterone cream. Perhaps the primary reason this is so popular is that it can be bought over the counter at most drug stores.

Your thyroid gland helps regulate your metabolism and the amount of calcium in your body by secreting of iodine-containing hormones. An insufficient amount of iodine in your diet can cause hypothyroidism. Kelp is a type of seaweed that provides a rich source of iodine.

Fats are important building blocks in the production of hormones. A large portion of hormones are composed of amino acids, fats and cholesterol. Any decrease in the level of important fats can have a negative effect on hormonal levels in the body. Many fats are readily available in a traditional diet.