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Participant Story and Thank You

We sometimes receive great testimonials and feedback from our D*action participants, and from others who are aware of the importance of the GrassrootsHealth mission. In response to one of our latest newsletters, one of...

Finding the right dose of vitamin D

Science Speaks: How much vitamin D do I need? We often receive questions about how much supplemental vitamin D someone should take. The key indicator of vitamin D status is the nutrient level in...

Initial Vitamin D Levels on the Rise

Our very first D*action test results came in just over 9 years ago, in January 2009. Over 11,500 individuals have now taken part in our “observational field trial” by sharing their vitamin D test...

Does exercise improve response to vitamin D?

Does Exercise Improve Response to Vitamin D? We looked at some of our D*action data to investigate that question… As part of the D*action questionnaire, we ask participants what level(s) of exercise they engage...