Masters of Health Magazine March 2026 | Page 77

Magnesium and

The Parathyroid Gland

By Curious Outlier

The parathyroid glands, located adjacent to the thyroid in the neck, are primarily known for their secretion of parathyroid hormone (PTH). PTH regulates calcium and phosphorus concentrations in the blood, working to raise calcium when it drops too low by acting on bones, kidneys, and the intestines. The release of PTH is triggered by the calcium-sensing receptor (CaSR) on parathyroid cells, allowing these glands to fine-tune calcium balance on a minute-by-minute basis. However, achieving this delicate homeostasis depends on the presence of adequate magnesium, and new evidence shows magnesium’s influence far exceeds what was once thought. [1, 5]

For the parathyroid gland to optimally synthesize and release PTH, it requires a stable internal environment with sufficient magnesium. In experimental settings, researchers consistently find that moderately low magnesium can promote PTH secretion as the gland attempts to counteract declining blood calcium.

This often masks an emerging magnesium deficiency at first, as the extra PTH helps maintain normal calcium levels. But when the deficiency becomes severe, magnesium’s absence disrupts key cellular processes required for PTH secretion, leading to a paradoxical and dangerous suppression of PTH. [4, 6, 7]

This paradox is now well-documented: in the case of severe hypomagnesemia (low magnesium), PTH secretion is inhibited even when blood calcium is alarmingly low. The underlying reason lies in magnesium’s stabilizing effect upon both the calcium-sensing receptor and several G-protein–mediated intracellular pathways in parathyroid cells. Without enough magnesium, these cells effectively lose their ability to “sense” calcium correctly and to release PTH, ultimately resulting in hypocalcemia that cannot be reversed until magnesium is restored. [6, 7]

The interplay between minerals within the body often tells a story of intricate balance, where the actions of one element reverberate through numerous physiological systems. Magnesium stands as one of the pivotal minerals, crucial for the proper operation of hundreds of enzymes and biological processes, and yet its full significance is often overlooked, especially regarding parathyroid gland function. While many have heard of the parathyroid gland’s vital role in maintaining stable levels of calcium and phosphorus, recent scientific research reveals that magnesium is intimately involved in virtually every aspect of parathyroid hormone (PTH) secretion and action, with profound implications for overall health and disease. [1, 2, 3, 4]