Connor McGovern Womens Jersey Can too Much Vitamin D be Toxic? | Dr. Kleins Healthy Heart Program


Can too Much Vitamin D be Toxic?

16 October 2014 Uncategorized , Tags: Healthy Heart

Last week in my downtown Toronto Dr. Klein’s Healthy Heart program class, I suggested that most adults living in the Northern Hemisphere, should take about 4000IU or 5000IU of vitamin D 3 daily, in the fall, winter and early spring. I discussed some of its benefits to human health, beyond its importance in regulating blood pressure and blood sugar, including its effectiveness at preventing the flu (perhaps more than the flu shot)vitamin D. In that context I suggested that when one comes down with flu symptoms, taking 10,000 IU of Vitamin D for the next couple of days may significantly shorten its duration.


These levels may seem high for some people who get most their vitamin D supplements from calcium pills, which generally contain between 400IU to 800IU. The perspective I offered to reduce concerns about “over-dosing” was that a single 20-30min sun tan session on a summer day, leads to production of 10,000iu to 20,000iu over the next few days (Vitamin D is produced first on the skin from cholesterol and the process takes several days). Imagine how much vitamin D you are getting if you spend time in the sun on a daily basis.

A couple of my students asked me what the symptoms of vitamin D toxicity were. Since vitamin D toxicity is rare and it is not something I have had to deal with in the past, I didn’t remember what the symptoms of toxicity were and I had to to look it up.

According to the information presented on the website of the vitamin D council, toxicity may develop, in theory, after using 10,000IU vitamin D daily for 3 months. It will more likely occur after using 50,000IU daily for three months. Since vitamin D is responsible for calcium absorption, Excessive blood levels of vitamin D result in calcium overload (hypercalcemia), which may be experienced as:

  • feeling sick or being sick
  • poor appetite or loss of appetite
  • feeling very thirsty
  • passing urine often
  • constipation or diarrhea
  • abdominal pain
  • muscle weakness or pain
  • feeling confused
  • feeling tired

While the levels of vitamin D3 supplementation I recommend seem high for some, I believe these levels are well supported by scientific data and it can help ensure the prevention if various conditions related to vitamin D deficiency. The best way to know whether you are deficient in, or have excess of, vitamin D, is by asking your doctor for a blood test for vitamin D.

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