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New Canadian study aims to find right vitamin D dose for strong bones

Posted on: January 23, 2014   by  Vitamin D Council


Researchers at the University of Calgary are currently seeking participants for a new trial which hopes to determine how much vitamin D is enough to build and maintain healthy bones.

The researchers are currently seeking 300 volunteers between the ages of 55 and 70 to participate in a randomized controlled trial. In the trial, 100 volunteers will receive 400 IU/day of vitamin D, 100 volunteers will receive 4,000 IU/day, and 100 volunteers will receive 10,000 IU/day.

“There are currently no large-scale, high quality studies that look at the relationship of bone strength and vitamin D dose,” stated Dr. Steven Boyd, a member of the research team. “This study will provide evidence that will help people determine how much vitamin D is appropriate for their bones.”

During the trial, the volunteers will have their bone density and strength measured by the world’s first XtremeCT2 machine. This machine allows researchers to take very detailed pictures of the bone to see exactly what is happening in the bone at different vitamin D doses.

“No one has really been able to establish what clearly is the best dose of vitamin D. We have a pretty good idea that it’s at least 400 units a day in addition to what we get in our diets, but there remains controversy as to whether that is just adequate and whether there’s more benefit in taking a higher dose,” said Dr. David Hanley, another member of the research team.

The study is set to follow participants over the next 3 years. Along with bone health, the researchers will look at how vitamin D relates to things like mood and depression.

If you meet the criteria and are interested in participating in the study, you can contact the study team by emailing [email protected] or by calling 403-220-3888.


Schmidt, C. How much vitamin D do you need? CTV Calgary, 2014.

3 Responses to New Canadian study aims to find right vitamin D dose for strong bones

  1. Rita and Misty

    I wish studies would emphasize 25(OH)D level rather than daily dosage.

    Yes, I understand why.

    Yet, I would be deficient on 5,000 iu D3 daily.

    And I cannot be the only human being with this problem.

    I am not that unique.

  2. Michael

    I lived in Canada for years and along the border almost half of my life. I want to have faith in the Research for strong bones, mood, etc being done in Calgary because it is CANADA. I am not holding my breath. What is being built into their research to negate the true results — I guess they had to ask the pharmaceutical companies what to find… and then used their very own snow-white noggins to devise their soon to be evil plan.

  3. Magic

    I have been on this site for a long time. I heard about people taking 20,000 iu a day and others taking more, like Rita 38,000 a day in the winter. Slowly, I have raised the amount I was taking and for a week or so I took close to 40,000. I found I didn’t need it so I dropped back to 20,000 daily. All of the pluses are there for me and I have NO toxicity nor am I expecting any. My wife’s doctor, however, made a HUGE FUSS, getting the local police involved because I was causing my wife harm. She now has terrible pain throughout her body and takes LOTS of aleve and other great pills that cause stomach problems. She hasn’t had any D3 pills since October 31. Her doctor thinks this is “wonderful.” ……..I go along with Dr Cannell’s recommendations and think all people, especially older ones, should take at least 5000 a day. There is NO DOUBT in my mind that huge numbers of people die of pneumonia and other broncial problems yearly who would be still around if they would take D3 as needed. I used to have colds, flu, etc.and now I breathe freely. I will be 80 this month.

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