Insulin is a hormone produced by the pancreas that helps regulate blood sugar levels. It allows cells to take in glucose from the blood and use it for energy.

Growth hormone is a hormone produced by the pituitary gland that stimulates growth and development in children and adolescents. It also helps regulate metabolism and body composition.

Estrogen is a hormone produced by the ovaries that plays a key role in regulating the menstrual cycle and pregnancy. It helps prepare the uterus for implantation of a fertilized egg and maintains the pregnancy.

Epinephrine is a hormone produced by the adrenal glands that prepares the body for the fight-or-flight response. It increases heart rate, blood pressure, and breathing, and diverts blood flow to muscles.

Thyroxine is a hormone produced by the thyroid gland that regulates metabolism. It helps control the rate at which the body burns calories and produces energy.

Melatonin is a hormone produced by the pineal gland that helps regulate sleep-wake cycles. It is released in response to darkness and helps promote sleepiness.

Prolactin is a hormone produced by the pituitary gland that stimulates milk production in women after childbirth.

Corticotropin-releasing hormone is a hormone produced by the hypothalamus that stimulates the release of other hormones, including adrenocorticotropic hormone (ACTH) and prolactin.

Parathyroid hormone is a hormone produced by the parathyroid glands that helps regulate calcium and phosphate levels in the blood.

Erythropoietin is a hormone produced by the kidneys that stimulates the production of red blood cells in the bone marrow.

Interleukin-2 is a hormone produced by activated T cells that stimulates the production of white blood cells, including T cells, B cells, and natural killer cells.

Interferon is a hormone produced by infected cells that stimulates the production of antibodies by B cells.

Adrenocorticotropic hormone is a hormone produced by the pituitary gland that stimulates the production of cortisol by the adrenal glands.

Thyrotropin-releasing hormone is a hormone produced by the hypothalamus that stimulates the production of thyroid hormones by the thyroid gland.

Growth hormone-releasing hormone is a hormone produced by the hypothalamus that stimulates the production of growth hormone by the pituitary gland.