The headline “Stop taking vitamin D immediately if you have these 4 symptoms” is partly based on a real issue but is too alarmist. Vitamin D toxicity is uncommon and is usually caused by taking excessive supplements, not by normal food or sunlight exposure.
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MedlinePlus
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⚠️ Symptoms that can occur with too much vitamin D
Excess vitamin D raises calcium in the blood. Warning symptoms can include:
Nausea or vomiting
Marked weakness or unusual fatigue
Excessive thirst and frequent urination
Constipation or poor appetite
More serious toxicity can cause confusion, kidney stones, kidney damage, or abnormal heart rhythms.
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Office of Dietary Supplements
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💊 How much is too much?
For most adults, the established upper intake level is 4,000 IU (100 micrograms) per day from supplements and food combined, although doctors may temporarily prescribe higher doses to treat a documented deficiency with monitoring.
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Office of Dietary Supplements
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Don’t automatically stop a prescribed vitamin-D treatment because of these symptoms. If you’re taking high-dose vitamin D and develop several of these symptoms, contact your doctor; blood tests for calcium and vitamin D levels can determine whether toxicity is actually present.
And if you have severe vomiting, confusion, significant weakness, an abnormal heartbeat, or symptoms of kidney problems, seek urgent medical care.
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