too high, a condition called **hypercalcemia**. ([Mayo Clinic][1])
Discover more
Neurological Conditions
vitamin
Chemistry
That does **not** mean everyone taking vitamin D should stop. If you are taking a dose prescribed by your healthcare professional, follow their advice unless they tell you otherwise.
## 1. Nausea, Vomiting, or Loss of Appetite
Chemistry
One of the more common signs of excessive vitamin D is digestive upset.
Possible symptoms include:
* Nausea
* Vomiting
* Poor appetite
* Abdominal discomfort
These symptoms happen because high vitamin D levels can raise calcium in the blood. ([Mayo Clinic][