People often contact GrassrootsHealth asking if they can participate if they live outside of the United States.  Our answer: “Yes!”


D*action participants can be found in 55 countries around the world. Within the United States, there are over 9500 participants with representation from all 50 states and Washington, D.C.

  • 97% of worldwide participants are in the United States, Canada, United Kingdom, or Australia.
  • Rounding out the top ten countries are Japan, Netherlands, Ireland, New Zealand, Sweden, and Spain.

  • 43% of the participants in the United States are in California, Texas, Florida, Illinois, Washington, or Pennsylvania.

Thank you to all our participants around the world!

Vitamin D Deficient - Hispanic Couple Smiles