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Vitamin D toxicity is unusual from food or sunlight. When it occurs, it is usually the result of taking **very large amounts of vitamin D supplements for an extended period**.
Excessive vitamin D can cause dangerously high calcium levels.
Possible symptoms include:
* nausea
* vomiting
* weakness
* confusion
* excessive thirst
* frequent urination
* dehydration
Very high vitamin D levels may lead to **kidney stones and, in severe cases, kidney failure**.
People taking high-dose vitamin D for a documented deficiency should follow the dose and monitoring plan recommended by their healthcare professional.
## 3. Vitamin C
Vitamin C is water-soluble, so excess amounts are largely eliminated through urine.
That does not mean extremely high doses are harmless.
