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Information on the latest vitamin D news and research.

Find out more information on deficiency, supplementation, sun exposure, and how vitamin D relates to your health.

Primary hyperparathyroidism: Is vitamin D safe?

Primary hyperparathyroidism (PHPT) causes elevated blood calcium levels (hypercalcemia) through the excessive secretion of parathyroid hormone (PTH), usually from a benign tumor of the parathyroid glands.

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About John Cannell, MD

Dr. John Cannell is founder of the Vitamin D Council. He has written many peer-reviewed papers on vitamin D and speaks frequently across the United States on the subject. Dr. Cannell holds an M.D. and has served the medical field as a general practitioner, emergency physician, and psychiatrist.

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