The concern is usually too much vitamin D, which can lead to high calcium levels (hypercalcemia). If you’ve been taking high doses of vitamin D and develop symptoms like these, you should contact your healthcare provider promptly:
- Persistent nausea or vomiting
- Excessive thirst and frequent urination
- Confusion, unusual drowsiness, or weakness
- Severe abdominal pain, constipation, or muscle weakness
These symptoms are not specific to vitamin D toxicity and can be caused by many other conditions. A blood test measuring 25-hydroxyvitamin D and calcium is usually needed to determine whether vitamin D is the cause.
When vitamin D is generally safe
For most adults, taking vitamin D at recommended doses is safe. Vitamin D toxicity is rare and almost always results from taking very high-dose supplements for a prolonged period, not from normal sun exposure or eating vitamin D-rich foods.
Seek urgent medical care if you have
- Severe confusion or difficulty staying awake
- An irregular heartbeat
- Severe dehydration from persistent vomiting
- Any other severe or rapidly worsening symptoms
If you’re taking vitamin D because it was prescribed or recommended by your healthcare provider, don’t stop it without discussing it with them unless you’ve been instructed to do so or you have symptoms that require immediate medical evaluation.
If you tell me your age, how much vitamin D you take (IU per day), and why you’re taking it, I can help explain whether your dose is within the usual recommended range.
