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Serum Level vs Intake (Ages 18+ years)

Why check your vitamin D serum levels? In an analysis of vitamin D serum levels and daily supplemental vitamin D intake amounts for 7324 D*action participants, we found that while average serum level rises...

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Moving Research into Practice Charts Booklet

Moving Research into Practice Charts Booklet This booklet contains charts based on data collected in the GrassrootsHealth study as well as several studies by our scientists and other vitamin D researchers.  It is a...

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Scientists’ Call to D*action

Scientists’ Call to D*action A Scientists’ Call to Action has been issued to alert the public to the importance to have vitamin D serum levels between 40 and 60 nanograms/milliliter (100-150 nanomoles/liter) to prevent...

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Pain Chart

Pain Level vs Serum Level Using data provided by participants in the D*action study, GrassrootsHealth was able to compare 25(OH)D serum levels with location and severity of pain as reported by participants. The average...

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Harness the Power of the Sun Infographic

Harness the Power of the Sun for Health Sun avoidance is as dangerous to your health as smoking. Source: 2016 study Lindqvist All the information you need to educate anyone on the health benefits...