Hypervitaminosis D is a condition that occurs after taking very high doses of vitamin D.
The cause is excess intake of vitamin D. The doses need to be very high, far above what most medical providers normally prescribe.
There has been a lot of confusion about vitamin D supplementation. The recommended daily allowance (RDA) for vitamin D is between 400 and 800 IU/day, according to age and pregnancy status. Higher doses may be needed for some people, such as those with vitamin D deficiency, hypoparathyroidism, and other conditions. However, most people do not need more than 2,000 IU of vitamin D a day.
For most people, vitamin D toxicity only occurs with vitamin D doses above 10,000 IU per day.
An excess of vitamin D can cause an abnormally high level of calcium in the blood (hypercalcemia). This can severely damage the kidneys, soft tissues, and bones over time.
The symptoms include:
The health care provider will examine you and ask about your symptoms.
Tests that may be ordered include:
Your provider will likely tell you to stop taking vitamin D. In severe cases, other treatment may be needed.
Recovery is expected, but permanent kidney damage can occur.
Health problems that can result from taking too much vitamin D over a long time include:
Call your provider if:
To prevent this condition, pay careful attention to the correct vitamin D dose.
Many combination vitamin supplements contain vitamin D, so check the labels of all the supplements you are taking for vitamin D content.
Reviewed By: Brent Wisse, MD, Associate Professor of Medicine, Division of Metabolism, Endocrinology & Nutrition, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.