That headline is referring to possible vitamin D toxicity — usually caused by taking high-dose supplements for too long, not from normal sunlight exposure or typical food intake.
Doctors commonly warn people to stop vitamin D supplements and seek medical advice if they develop symptoms linked to high calcium levels (hypercalcemia) from excess vitamin D.
The most commonly cited warning symptoms are:
- Severe nausea, vomiting, or loss of appetite
- Extreme thirst and frequent urination
- Confusion, fatigue, dizziness, or unusual mental changes
- Muscle weakness, bone pain, or kidney stone symptoms (Cleveland Clinic)
Other possible signs include constipation, dehydration, irregular heartbeat, and abdominal pain. (Healthline)
A few important points:
- Vitamin D toxicity is rare.
- It almost always comes from over-supplementation, especially very high daily doses (often >10,000 IU/day for long periods). (Healthline)
- Normal recommended supplementation is usually much lower and often safe when monitored properly.
- The safest way to know whether you need vitamin D is a blood test for 25-hydroxy vitamin D.
If someone develops these symptoms while taking vitamin D supplements, they should contact a healthcare professional and may need blood tests for:
- Vitamin D level
- Calcium
- Kidney function (Cleveland Clinic)
