Vitamin D is important for bone health, muscles, and immune function, but taking too much vitamin D can cause problems because it can raise calcium levels in the blood (hypercalcemia). Most people taking recommended doses do not experience serious side effects.
Doctors may advise stopping or reducing vitamin D supplements and seeking medical advice if you develop symptoms that could suggest excessive intake, such as:
1. Nausea, vomiting, or loss of appetite
High vitamin D levels can increase calcium in the blood, which may upset the digestive system.
2. Excessive thirst and frequent urination
Too much calcium can affect the kidneys, leading to increased thirst and needing to urinate more often.
3. Weakness, fatigue, or confusion
High calcium levels can cause unusual tiredness, muscle weakness, dizziness, or mental changes.
4. Kidney-related symptoms
Possible warning signs include:
- Flank or back pain
- Kidney stones
- Changes in urination
Important points:
- Vitamin D toxicity is rare and usually occurs from very high doses over time, not from normal dietary intake or typical prescribed amounts.
- Do not stop a vitamin D supplement that was prescribed for a medical reason without discussing it with your healthcare professional.
- If you take high-dose vitamin D, calcium supplements, or have kidney disease, ask your doctor about monitoring blood calcium and vitamin D levels.
