Be Extra Careful?
Extra caution may be needed if you:
* Take high-dose vitamin D
* Also take calcium supplements
* Have kidney disease
* Take medications that affect calcium
* Have certain endocrine conditions
* Have been supplementing for long periods without testing
## When to Seek Urgent Care
Seek prompt medical attention if you develop:
* Severe vomiting
* Marked weakness
* Confusion
* Severe dehydration
* Significant kidney pain
* Irregular heartbeat
* Very reduced urination
These symptoms can have many causes, but they should not be ignored.
## The Bottom Line
Vitamin D is essential, but excessive supplementation can be harmful.
