I aim for blood levels of 60-70 ng/ml in my patients. In 1000 patients, I have not uncovered a single episode of increased calcium caused by vitamin D. Nonetheless, the safest way to proceed is to always check a blood level of vitamin D. I add a blood calcium when there are unusual circumstances in a patient's situation, such as a history of high calcium, a history of hyperparathyroidism, kidney disease, thiazide diuretics, sarcoidosis, and some other rare situations.
But, all in all, vitamin D is an amazingly empowering, health-restoring or -maintaining strategy, and toxicity is an unusual occurrence. Don't be afraid of vitamin D; just be aware of some of the special issues that surround its safe use.
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