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  • D*action - Vitamin D Testing Research Study
    What’s your vitamin D level? Find out with our home test kit Research has demonstrated many health benefits of higher vitamin D levels What do scientists say is the target amount? 48 world-wide vitamin D researchers agree it is 40-60 ng ml (100-150 nmol L) Determine your level today Learn about the many benefits of vitamin D
  • D*action - Get Started
    D*action Study Participant Welcome! You are about to become a participant in the world’s largest vitamin D project, D*action You may choose to enroll 1-time to test your levels with an extended health questionnaire or you may participate for the full 5 year project where you provide your health information along with a vitamin D test (and additional tests of your choice) each 6 months for
  • D*action - Benefits of Vitamin D
    Research has demonstrated many health benefits of higher vitamin D levels Learn about the many benefits of vitamin D
  • D*action - How it Works
    Real lab tests from your own home Order our vitamin D screening kit, choose from additional tests to add, follow the simple instructions, mail it back to us You will receive your D level 7-10 days after receipt of the completed test and online questionnaire Start Here
  • D*action - Research Consent
    Research Consent The purpose of this population study is to offer testing and or feedback about results and education to make necessary lifestyle changes to effect serum level concentrations In this study you will create an account with GrassrootsHealth (GRH), fill out a health questionnaire and receive vitamin D test results either from a home blood spot test provided by GRH or from a
  • D*action - Share Your Story
    What is your vitamin D level? Are you within the recommended 40-60 ng ml?





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