Parathyroid Hormone (PTH) is a crucial hormone produced by the parathyroid glands, which are small glands located in the neck behind the thyroid. PTH plays a vital role in regulating the body's calcium levels. When calcium levels in the blood drop, PTH is released to increase calcium by stimulating the release of calcium from bones, enhancing calcium absorption in the intestines, and promoting calcium reabsorption in the kidneys. This hormone helps maintain a delicate balance of calcium, which is essential for various bodily functions, including muscle contraction, nerve signaling, and blood clotting. An imbalance in PTH can lead to conditions such as hyperparathyroidism or hypoparathyroidism, affecting overall health.