Does vitamin D supplementation in primary hyperparathyroidism increase the risk of kidney stones?  

Hyperparathyroidism does increase the risk of developing kidney stones. A study in New England Journal of Medicine, Broadus et al., PMID 7351950, reported that patients with elevated concentrations of 1,25-dihydroxyvitamin D are at increased risk for kidney stones. The reason is that 1,25-dihydroxyv...