Hormones are chemical messengers responsible for influencing numerous functions in your body. The organs that produce your hormones are together known as the endocrine system. The endocrine system includes the pancreas, thyroid, ovaries and testicles. Common endocrine hormones include thyroid hormone, estrogen, progesterone, and testosterone. Your body’s hormones are vital to your health and vitality. If even a small part of your endocrine system is not working properly, your body cannot perform as well.