Vitamin D is important for bone health, muscle function, and immune health, but taking too much vitamin D—especially high-dose supplements without medical guidance—can cause problems. The body stores vitamin D, so excessive intake over time can lead to high calcium levels in the blood (hypercalcemia).
You should contact a healthcare professional if you are taking vitamin D supplements and develop symptoms that could suggest excess intake, such as:
- Nausea, vomiting, or loss of appetite
- High calcium levels can upset the digestive system.
- Unusual thirst and frequent urination
- Excess vitamin D can affect calcium balance and kidney function.
- Weakness, fatigue, or confusion
- These can occur when calcium levels become too high.
- Kidney-related symptoms
- Such as flank pain or signs of kidney stones.
Other possible signs include constipation, abdominal discomfort, or irregular heartbeat in more severe cases.
Do not stop prescribed vitamin D therapy without talking to your clinician, especially if it was recommended for a deficiency or a specific medical condition. The right dose depends on factors such as your blood vitamin D level, age, diet, sun exposure, and health status.
If you tell me your vitamin D dose (for example, 1,000 IU daily or 50,000 IU weekly) and why you’re taking it, I can help put the risk into context.
