Vitamin D: when should you stop and seek medical advice?
The headline “Stop taking vitamin D immediately if you have these 4 symptoms” is too dramatic. Vitamin D is important for calcium absorption and bone health, and most people tolerate recommended doses well. The concern is vitamin D toxicity, which is usually caused by taking excessive amounts of supplements over time—not by normal sunlight exposure.
Four symptoms that can occur with excessive vitamin D and high blood calcium include:
- Nausea or vomiting
- Unusual weakness or fatigue
- Excessive thirst and frequent urination
- Confusion or other changes in mental state
Other possible symptoms include constipation, poor appetite, dehydration and kidney stones. Severe toxicity can cause kidney problems and abnormal heart rhythms.
What should you do?
If you develop these symptoms while taking a high-dose vitamin D supplement, don’t take additional doses until you’ve spoken with a healthcare professional, particularly if the symptoms are significant. A clinician can check blood calcium and vitamin D levels and assess kidney function.
For adults, the U.S. NIH lists 4,000 IU (100 micrograms) per day as the usual upper intake level from all sources, although doctors may prescribe higher doses temporarily to treat a documented deficiency.
Don’t stop a medically prescribed vitamin D treatment permanently based on a social-media warning. If you tell me how many IU of vitamin D you’re taking each day, how long you’ve taken it, and whether you’re also taking calcium, I can help you understand whether the dose is within the usual range.
