“Stop Vitamin D Immediately If You Have These 4 Symptoms” — What’s Actually True
Vitamin D is generally safe at recommended doses, but taking too much can cause vitamin D toxicity. The problem is usually an excessive amount of supplementation, which can raise blood calcium to dangerous levels.
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Office of Dietary Supplements
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Four symptoms that can occur with excessive vitamin D include:
Persistent nausea or vomiting — particularly if accompanied by other symptoms.
Extreme thirst and frequent urination — caused by high calcium levels.
Marked weakness, fatigue, or confusion — possible manifestations of hypercalcemia.
Abdominal or kidney-stone pain — excessive calcium can contribute to kidney stones and, in severe cases, kidney damage.
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nhs.uk
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These symptoms do not prove that vitamin D is the cause. They can result from many other conditions, so don’t discontinue a medically prescribed treatment solely because you develop one of them. However, if you suspect you’ve taken too much vitamin D, contact a healthcare professional promptly; testing can include blood calcium and vitamin D levels.
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NHS SPS
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How much is too much?
For most adults, the tolerable upper intake level is 4,000 IU (100 mcg) of vitamin D per day from all sources. This is a safety ceiling, not a recommended daily dose, and a doctor may temporarily prescribe higher doses to treat a documented deficiency.
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Office of Dietary Supplements
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Don’t stop a prescribed vitamin D treatment without talking to your clinician. If you have severe vomiting, confusion, significant weakness, an irregular heartbeat, or symptoms suggesting severe hypercalcemia, seek urgent medical care.
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