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Vitamin D is important, but taking too much vitamin D (usually from high-dose supplements, not normal sun exposure or food) can cause toxicity. The main concern is high calcium levels in the blood (hypercalcemia). Symptoms that can occur with excessive vitamin D intake include:
- Nausea, vomiting, or loss of appetite
- Unusual thirst and frequent urination
- Weakness, fatigue, or confusion
- Constipation or abdominal discomfort
If someone taking vitamin D supplements develops these symptoms—especially after using high doses—they should stop taking the supplement and contact a healthcare professional for advice. A clinician may recommend checking blood levels such as 25-hydroxyvitamin D and calcium.
For most people, recommended doses are safe, but very high doses taken for long periods can be harmful. The right amount depends on factors like age, diet, sun exposure, and medical conditions.
