So we see that the thyroid gland is very much connected to the parathyroid gland. Now the next question is what are the hormones or hormone that is released by the parathyroid gland? So we basically only have one hormone. The hormone is known as the parathyroid hormone. And this parathyroid hormone is produced in special cells inside the parathyroid gland known as the parathyroid chief cells or the parathyroid principal cells. And these cells basically produce and secrete the parathyroid hormone.