Published on September 16, 2015

September 16, 2015

We started GrassrootsHealth in 2007 by traveling the world and talking to vitamin D researchers. As you all know these researchers banded together to recommend everyone get their serum levels between 40-60 ng/ml. But many of us struggle with how to get there. Sun? Food? Supplementation?

The starting point is to test your levels twice a year, ideally now and in March. In September your levels should be at their highest since we just finished the summer. In March, they are typically the lowest, after winter.

After you receive your test results, you can use the charts and information below to help decide a supplementation level for you. The data comes from the 1000’s of you who have participated in this project! Thank you! With the D*action data we can use science to help predict where your serum level will be with supplementation.

While average vitamin D serum levels achieved with specific supplementation amounts are useful guidelines, it is important to recognize the wide range of serum levels that can be produced at any specific supplementation amount. The serum level can vary greatly from low to high (20 ng/ml to 120 ng/ml for the same supplementation amount), indicating the importance of measuring your serum level to determine the success of supplementation.

The chart in this newsletter indicates the additional daily intake observed to produce noted serum levels in participants of our D*action study (N=7324, adults over 18 yrs, average weight = 150 lbs).

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