How much vitamin D should I take?

Using data from our D*action project, we have created D*calculator. With this calculator you can enter your current vitamin D serum level, your desired vitamin D serum level, and your weight. The calculator will tell you how much more vitamin D you need to achieve your desired serum level with both a 50% probability and a 90% probability. Give it a try!

How does it work?

GrassrootsHealth has analyzed the data of all of our D*action participants. We have plotted the dose response curve - a line plot of the average serum levels associated with each supplement dose. You will see that every dose has a wide range of serum levels - which is why we can't recommend a specific dose without first testing.

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50% probability? 90% probability?

Using the data plotted in the chart, we calculated the average serum level for each supplement dose, as defined by the blue line. We also did a probability-based analysis to determine the supplement dose  necessary to move 50% of the population from one serum level to another, and another supplement dose that would get 90% of the population across that same range. Of course the 90% number is substantially higher.

Think of vitamin D levels like cholesterol levels

It would be much easier if there were a magic number that worked for everyone, but there isn't. Instead, think of your vitamin D level like your cholesterol - this will help you expertly manage it.

Like cholesterol...  not everyone has the same level. You can't predict by height, weight, diet, or supplementation what your level will be. You need to test.

Like cholesterol...  if the test did not come back with your desired result you need to make a change.  For cholesterol that might be diet and exercise. For vitamin D it is likely to be more sun, supplements, or vitamin D rich foods.

Like cholesterol... you have to make the change consistently for a period of time, we recommend six months, and test again. See if your changes were effective. Do you need more? Less?

Enjoy!

Use this calculator for yourself, and pass along to curious friends. If you want to encourage your friends and family to test their vitamin D levels this holiday season, consider purchasing multiple test kits at a 40% discount using our D*advocate program.

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The Season of Giving

Why are we fundraising now? As we continue to gather data to analyze and publish, as we move forward with demonstration projects such as Protect our Children NOW!, funds from the test kits do not cover everything. Here are some examples of what extra donations could help to cover:

• $ 3,000 - sponsors one paper to be published 'open access' so that everyone can read the full paper.
• $ 5,000 - hosts one new CME video for a year - allowing doctors to learn about vitamin D as part of their continuing medical education.
• $ 150,000 - starts one new Protect our Children NOW! initiative.
• ANYTHING you wish to give is most appreciated!

Can you help?

If you want to donate toward these types of programs, click here. Also, you can give us contacts of companies who you think might want to sponsor one of these initiatives. If you have a contact you wish to share with us, please contact customersupport@grassrootshealth.org.

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