Vitamin D affects the parathyroid gland in several ways. Low levels of vitamin D reduce the efficiency of calcium absorption, which in turn leads to increased secretion of parathyroid hormone (PTH). This hormonal response is an attempt to raise serum calcium levels. Additionally, low levels of vitamin D can contribute to parathyroid problems. On the other hand, when blood-calcium levels are high, the production of PTH is decreased. Therefore, vitamin D, by aiding in calcium absorption, can help regulate the function of the parathyroid gland. It is important to note that parathyroid tumors can also cause low vitamin D levels. Therefore, maintaining adequate levels of vitamin D through diet, sunlight exposure, or supplementation may help in maintaining the balance of PTH and calcium levels in the body.

Sources

The parathyroid glands and vitamin D - Endocrinology - NCBI BookshelfVitamin D Status and Its Association with Parathyroid Hormone Concentration in Brazilians - PMC - NCBILow Vitamin D Levels and Low Vit D in Parathyroid Disease and Hyperparathyroidism. Low Vitamin D Is Not Good For You!Vitamin D Insufficiency as a Cause of Hyperparathyroidism - AAFPHyperparathyroidism - Symptoms & causes - Mayo ClinicVitamin D and Hyperparathyroidism - Advanced Parathyroid Surgery of New York

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