⚠️ Pharmacist Warning: What Everyone Taking Vitamin D Should Know
Vitamin D is important for bone health and other body functions, but more isn’t necessarily better. Excessive vitamin D—particularly from high-dose supplements taken over time—can cause calcium to build up in the blood, potentially affecting the kidneys and heart.
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Office of Dietary Supplements
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Before taking vitamin D supplements:
Check the dose and add up vitamin D from all supplements you take.
For adults, 4,000 IU (100 mcg) per day is the established upper intake limit unless a healthcare professional has specifically recommended a higher dose for treatment.
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Office of Dietary Supplements
High doses can cause nausea, vomiting, weakness, excessive thirst or urination, kidney stones, and—in severe toxicity—kidney or heart problems.
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Office of Dietary Supplements
Vitamin D can interact with certain medicines, including thiazide diuretics, steroids, orlistat, and some statins.
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Office of Dietary Supplements
Important: Don’t stop a vitamin D prescription on your own. If you’re taking a high dose to treat a diagnosed deficiency, follow your clinician’s instructions and any recommended blood testing.
The real warning isn’t “never take vitamin D”—it’s “don’t take unnecessarily high doses.”
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