Participant Resources

Thank you for being a Citizen Scientist in GrassrootsHealth’s vitamin D*action study. Your participation provides you with life-changing health information along with access to life-empowering research.

Below are links to our top participant resources and access to the latest research findings from a panel of the world’s leading Scientific Experts on topics that mater to your health.

Should you have any questions please contact Customer Service at [email protected].

Test Results Resources

Have you just received your test results and have questions about your result or what to do about it? Click the links below for information on how to interpret your results, common questions, and next steps to take.

Not sure what to test?

Customize Your Vitamin D*action Participation, Add Tests for More InsightsLearn more about your options here.

Top Blogs: How Your Results Relate to Your Health


Health Topics

Nutrition & Supplements

Intake, Omega-3, Toxicity, Testing, Vitamin D


Depression, Pain, Preventing Falls,

Muscle, Bone & Joint

Bone Health

Pregnancy & Children

Babies, Breastfeeding, Children’s Health, Preterm Birth

UV Exposure

Sunlight, Indoor Tanning