Melatonin is a hormone produced by the pineal gland in response to darkness. It plays a crucial role in regulating the body's circadian rhythm and promoting sleepiness.

Cortisol is a hormone produced by the adrenal glands in response to stress. It helps the body mobilize energy and cope with stressful situations.

Growth hormone, also known as somatotropin, is a hormone produced by the pituitary gland. It plays a crucial role in promoting growth and development in children and adolescents.

Insulin is a hormone produced by the pancreas. It helps regulate blood sugar levels by allowing glucose to enter cells for energy production.

Estrogen is a hormone produced by the ovaries. It plays a crucial role in regulating the menstrual cycle, preparing the uterus for pregnancy, and maintaining reproductive health.

Testosterone is a hormone produced by the testes in males and the ovaries in females. It plays a crucial role in stimulating growth and development, particularly in males, and maintaining muscle mass and strength.

Thyroxine, also known as T4, is a hormone produced by the thyroid gland. It plays a crucial role in regulating metabolism, energy expenditure, and growth and development.

Prolactin is a hormone produced by the pituitary gland. It plays a crucial role in stimulating milk production in women during pregnancy and after childbirth.

Parathyroid hormone, also known as PTH, is a hormone produced by the parathyroid glands. It plays a crucial role in regulating calcium and phosphate levels in the blood.

Calcitonin is a hormone produced by the thyroid gland. It plays a crucial role in lowering blood calcium levels when they become too high.

Antidiuretic hormone, also known as vasopressin, is a hormone produced by the hypothalamus and stored in the pituitary gland. It plays a crucial role in regulating fluid balance and blood pressure.

Aldosterone is a hormone produced by the adrenal glands. It plays a crucial role in regulating sodium and potassium balance in the body, helping to maintain blood pressure.

Epinephrine, also known as adrenaline, is a hormone produced by the adrenal glands. It plays a crucial role in the body's response to stress, preparing the body for a fight-or-flight response.

Dopamine is a hormone produced by the brain. It plays a crucial role in regulating mood, reward, and motivation.

Leptin is a hormone produced by fat cells. It plays a crucial role in regulating appetite and satiety, helping to control food intake and maintain a healthy weight.