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Low Vitamin D does not cause high calcium. Dr James Norman speaks at endocrinology conference on Vitamin D and low vitamin D. All patients with primary hyperparathyroidism and high calciuim have low vitamin D. See: http://www.parathyroid.com/low-vitamin-d.htm to see these graphs up close. Low vitamin D and calcium levels above 10.1 almost guarantee that a parathyroid tumor is present and parathyroid surgery is needed.