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Hypervitaminosis D - Are You Taking Too Much Vitamin D?

Written and reviewed by
Dr. Hanish Gupta 92% (1996 ratings)
MBBS, DNB (General Medicine)
General Physician, Delhi  •  17 years experience
Hypervitaminosis D - Are You Taking Too Much Vitamin D?

Vitamin D is a vitamin that plays a critical role in maintaining the health of your bones, teeth and joints, as well as in assisting immune system function. But taking too much of it can cause Hypervitaminosis D, a rare but serious condition.

Hypervitaminosis D causes an exponential increase in the levels of calcium in your blood. And this can affect your bones, tissues, and other organs. The condition can also cause high blood pressure, bone loss, and severe kidney damage if not treated.


  1. You get Vitamin D from the foods you eat and by exposure to the sun. Still, there is severe Vitamin D deficiency in people living all over the world, including the tropics like India. These people are prescribed vitamin D supplements, a move which can misfire, causing hypervitaminosis D.
  2. Hypervitaminosis D occurs usually due to taking high-dose vitamin D supplements. The recommended dose for Vitamin D is 100 microgram per day. Anything over this, for several months, can cause Hypervitaminosis D.
  3. Some prescription medications used to treat high blood pressure and heart diseases can cause an increase in vitamin D in the blood.
  4. Oestrogen therapy for post-menopausal women is another cause.
  5. Taking antacids for a long time increases the risk for getting hypervitaminosis D.
  6. Isoniazide, an anti-tuberculosis medication, can also lead to elevated levels of vitamin D.

You are more at risk for developing hypervitaminosis D if you take vitamin D supplements and have other health problems, such as:

Vitamin D and Type 2 Diabetes - What is the relation?

  • Vitamin D is most known for its role in bone health, but researchers are beginning to uncover its vital role in the function of the pancreas, the organ that secretes insulin.
  • Doctors believe there is a link between vitamin D and Type 2 Diabetes as studies have shown that people who have the lowest vitamin D levels in their blood are at an increased risk of developing T2D later in life. Similarly, most newly diagnosed diabetes patients have lower vitamin D levels than people without diabetes.
  • Vitamin D is prescribed by doctors in type 2 diabetes to help improve the body’s insulin sensitivity and thus reduce the risk of insulin resistance, which is often a precursor to type 2diabetes.
  • Vitamin D helps your body metabolise sugar in your blood as well as it regulates calcium, which also helps manage blood sugar.
  • The trick is to not overdo the vitamin D supplementation as it may cause hypervitaminosis D.

Now what makes hypervitaminosis D doubly dangerous is that it can cause raise blood calcium levels. This can lead to a condition called hypercalcemia which means that there is too much calcium in your blood.
The collective symptoms of these two conditions are:

If left untreated hypervitaminosis D can cause:

So, be very careful while taking vitamin D, especially if you have an existent problem with your kidneys or heart. And don’t overdo the vitamin supplementation if you have diabetes- it can backfire. If you wish to discuss about any specific problem, you can consult an Endocrinologist.

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