Take charge of your health & contribute to research

D*action will help you make informed decisions about your health – providing your exact D level and specific knowledge and advice about increasing your vitamin D level to improve your health. In addition, your health data furthers vitamin D research and innovation.

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Groundbreaking research.

Join the movement and help us move research into practice. Your participation in D*action, with your health information and your D level, allow us to compare vitamin D replete populations with the standard population. We publish this data. The more we publish the sooner vitamin D research moves into standard practice.

Learn more about our recent discoveries.

How it works.
Your data, your answers.

When you sign up, you’ll be asked to complete a survey of health and lifestyle related questions that will be linked to your vitamin D level.

Our expert panel of analysts, scientists and researchers study the data to discover new outcomes to provide you with information on how vitamin D directly impacts your health.

View a sample of our survey questions.

Our panel of experts.

University of California Scientists Panel

University of California Davis
  • Bruce D. Hammock, Ph.D.
  • A. Hari Reddi, Ph.D.
  • Ray Rodriguez, Ph.D.
University of California Los Angeles
  • John Adams, M.D.
  • Milan Fiala, M.D.
  • H. Phillip Koeffler, M.D.
  • Keith C. Norris, M.D.
University of California Riverside
  • Anthony W. Norman, Ph.D.
University of California San Diego
  • Richard L. Gallo, M.D., Ph.D.
  • Cedric F. Garland, Dr. P.H.
  • Frank C. Garland, Ph.D.
  • Edward D. Gorham, Ph.D.
  • Tissa Hata, M.D.
University of California San Francisco
  • David Gardner, M.S., M.D.
  • Bernard P. Halloran, Ph.D.

Panel of International Scientists

Ahepa University Hospital Thessaloniki ,Greece
  • Kalliopi Kotsa, MD, Ph.D.
  • Spyridon Karras , MD, Ph.D.
Baxter International
  • Mathew Mizwicki, Ph.D.
Boston University School of Medicine
  • Michael F. Holick, Ph.D., M.D.
Creighton University
  • Robert P. Heaney, M.D.
  • Joan M. Lappe, Ph.D., R.N.
Emory University
  • Vin Tangpricha, M.D., Ph.D.
Harvard School of Public Health
  • Carlos A. Camargo, Jr., M.D., Dr. P.H.
  • Edward Giovannucci, M.D., ScD.
  • Walter C. Willett, Dr. P.H., M.D.
Inova Comprehensive Cancer
  • Donald L. Trump, M.D.
Institute VitaminDelta
  • Raimund von Helden, M.D.
McGill University
  • John H. White, Ph.D.
Medical University of Graz, Austria
  • Stefan Pilz, M.D.
Medical University of South Carolina
  • Bruce W. Hollis, Ph.D.
  • Carol L. Wagner, M.D.
Mt. San Jacinto College
  • Laura P. Schoepf, Ph.D.
National Center for Global Health and Medicine
  • Tetsuya Mizoue, M.D., Ph.D.
Oregon State University, Linus Pauling Institute
  • Adrian F. Gombart, Ph.D.
Society For Medical Information and Prevention
  • Joerg Spitz, M.D.
Sunlight, Nutrition and Health Research Center
  • William B. Grant, Ph.D.
University of Albany - SUNY
  • JoEllen Welsh, Ph.D.
University of Alberta
  • Gerry Schwalfenberg, M.D., CCFP
University of Angers, France
  • Cedric Annweiler, M.D., Ph.D.
University of Auckland
  • Robert Scragg, M.D., Ph.D.
University of Birmingham
  • Martin Hewison, Ph.D.
University of Saskatchewan
  • Susan J. Whiting, Ph.D.
University of Toronto, Mt Sinai Hospital
  • Reinhold Vieth, Ph.D.
Vienna Medical University
  • Heidi S. Cross, Ph.D.
Vitamin D Council
  • John J. Cannell, M.D.
Wismar University of Applied Sciences
  • Alexander Wunsch, M.D.
Roswell Park Cancer Institute
  • Candace Johnson, Ph.D.
Royal National Orthopaedic Hospital, United Kingdom
  • Benjamin Jacobs, M.D.


All About Children Pediatric Partners
Reading, PA

Babylon Breast Cancer Coalition
Long Island, NY

Benedictine Hospital Oncology Support Program
Kingston, NY

Homefirst Health Services
Chicago, IL

Mattapan Community Health Center
Boston, MA

Reading Hospital Cancer Center
Reading, PA

Roswell Park Cancer Institute
Buffalo, NY

San Diego Black Nurses Association
San Diego, CA

Steiner Medical and Therapeutic Center
Phoenixville, PA

Ready to get the information to help take charge of your health?

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