If you are taking vitamin D supplements and experience the following symptoms—especially if you’re taking high doses—contact your healthcare provider promptly.
1. Persistent Nausea or Vomiting
Too much vitamin D can lead to high calcium levels, which may cause nausea, vomiting, or loss of appetite.
2. Excessive Thirst and Frequent Urination
High calcium levels can make you feel unusually thirsty and cause you to urinate more often.
3. Weakness, Fatigue, or Confusion
Severe vitamin D excess can affect the nervous system and lead to unusual tiredness, weakness, or confusion.
4. Kidney-Related Symptoms
High calcium levels may contribute to kidney problems, including:
- Pain in the side or lower back
- Kidney stones
- Reduced kidney function
What to Do
- Do not assume vitamin D is the cause of your symptoms.
- Review the dose you’re taking, especially if it’s higher than prescribed.
- Contact your doctor for advice and possible blood tests.
- Seek urgent medical attention if symptoms are severe.
Who Is Most at Risk?
People are more likely to develop vitamin D toxicity if they:
- Take very high-dose supplements for extended periods
- Accidentally take multiple vitamin D products
- Use supplements without monitoring when high doses have been prescribed
Vitamin D toxicity is usually caused by excessive supplementation, not by sunlight exposure or normal dietary intake.
Bottom Line
There are situations where a doctor may advise stopping vitamin D temporarily, but symptoms such as nausea, excessive thirst, confusion, and signs of kidney problems should be evaluated by a healthcare professional rather than self-diagnosed. Most people taking appropriate doses of vitamin D do not experience toxicity.
