Join scientists, healthcare practitioners, advocates, and individuals working together to advance Vitamin D knowledge, improve public health, and create measurable health outcomes worldwide.
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$4.99/mo · 7-day free trial
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Stay informed with the latest Vitamin D research, scientific discoveries, health insights, and community updates from GrassrootsHealth and leading experts around the world.
Why Settle for a Passing Grade When Better Health May Be Possible? Key Points A 2025 global review involving approximately 2.37 million people found that
Addressing vitamin D levels at any stage of breast cancer diagnosis can lead to better outcomes Key Points Research has shown an 82% lower rate
GrassrootsHealth to honor pioneering researchers November 2 in San Diego as millions enter the “vitamin D winter,” when sunlight across much of the U.S. no
Join us to learn more from the experts, get your questions answered, hear the latest research, and collaborate with our advocacy and outreach teams.
May
Tuesday, May 20, 2005-100 PM ST
June
Tuesday, June 10,2025 12:00 PM
June
Tuesday, June 24, 2025, at 1:00 PM ET
GrassrootsHealth advances public health through research, education, testing, and community collaboration. Together with scientists, healthcare professionals, and individuals around the world, we are creating a future where evidence-based knowledge leads to healthier lives.
How Vitamin D Changed the Life of a Doctor with MS – Her Journey and an Interview
The following is a narrative by Satya L. Nahu, MD. The Coimbra Protocol has helped thousands around the world overcome their autoimmune diseases using extremely high doses of vitamin D. Do not treat yourself without the guidance of a skilled practitioner…Read More
Disturbing Trends among Teenagers – How Nutrients CAN Help
“Mom… I feel like I’m dying.” The latest statistics show that almost 60% of teenage female students experienced persistent feelings of sadness or hopelessness and nearly 25% made a suicide plan. One mom’s story could help many others. Read More
Participant Story: Why I Keep My Vitamin D Above 100 ng/ml
The GrassrootsHealth panel of scientists recommends a vitamin D level between 40-60 ng/ml; what happens when higher levels are maintained? Bob is a long-time participant in the GrassrootsHealth D*action project who shares his story here. Read More
Vitamin D Can Turn Your Health Around
Vitamin D has helped me to walk, to sleep, to get off medication; After many years of research and personal use of vitamin D, I strongly believe in the preventive and curative powers of vitamin D for cancer and other health problems. Read More
Read inspiring stories from our community.
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Join the world's largest vitamin D research study while tracking your own vitamin D status.
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The world’s leading vitamin D scientists and experts dedicated to advancing vitamin D research into public health and practice.
Can Vitamin D Prevent Breast Cancer? What is your D level? What’s the Evidence? There have been many studies on vitamin D and breast cancer
The Vitamin D Deficiency Epidemic 40-75% of the entire world’s population is vitamin D deficient. The causal link between severe vitamin D deficiency and rickets
Results of multiple studies regarding the association between 25(OH)D and various diseases…
Vitamin D Supplement Doses and Serum 25-Hydroxyvitamin D in the Range Associated with Cancer Prevention Cedric F. Garland, Christine B. French, Leo L. Baggerly, and
All-Source Basal Vitamin D Inputs Are Greater Than Previously Thought and Cutaneous Inputs Are Smaller Robert P. Heaney, Laura A. G. Armas, and Christine French
A Novel Approach Localizes the Association of Vitamin D Status With Insulin Resistance to One Region of the 25-Hydroxyvitamin D Continuum Robert P. Heaney, Christine
Symposium in Print on the Epidemiology of Vitamin D and Cancer Cedric F. Garland With this issue, we conclude a set of papers assembled for
Vitamin D for Cancer Prevention: Global Perspective Cedric F. Garland, Dr PH, FACE, Edward D. Gorham, MPH, PHD, Sharif B. Mohr, MPH and Frank C.
Vitamin D and Cancer Mini-Symposium: The Risk of Additional Vitamin D Reinhold Vieth Any benefit of vitamin D needs to be balanced against the risk
A New Umbrella Review Highlights Benefits for Several Allergic Conditions Key Points A new review found that lower vitamin D levels were consistently associated with
Introducing Dr. Renu Mahtani, physician, author, and global educator in autoimmune health, nutritional medicine, and vitamin D therapy – and the first special guest scientist
In this in-depth presentation, Dr. Bruce Hollis, PhD, a leading expert in vitamin D, pediatrics, and maternal health, explores the critical role of vitamin D
Higher magnesium intake was associated with 53% lower odds of sarcopenia, highlighting magnesium’s potential importance for preserving muscle health, strength, and function with age Key
New research suggests that maintaining adequate vitamin D and B vitamin status may help support healthy brain aging long before dementia develops. Key Points Older
Practical tips and skin-nourishing nutrients to help implement intelligent sunshine exposure into your regular routine Key Points The goal of intelligent sun exposure is gradual
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From running the world’s largest population field trial on vitamin D and contributing to groundbreaking nutrient research, to award-winning initiatives empowering individuals and health practitioners with education and evidence-based resources.
Founded by Carole Baggerly with the mission of moving vitamin D research into practice.
Enrollment opens and the first Scientists' Call to D*action is signed by 40 international vitamin D scientists.
The first scientific paper using D*action study data is published.
Large prenatal vitamin D project launches to improve prenatal & neonatal health.
GrassrootsHealth receives the American College of Nutrition Humanitarian Award.
Our paper on breast cancer risk and vitamin D serum level is awarded the top 10% of 2018 papers published in PLOS ONE for being cited in other research
Receives the NBJ Award for Excellence in Education and the Mercola Achievement Award.
Publication of Evidence that Vitamin D Supplementation Could Reduce Risk of Influenza and COVID-19 Infections and Deaths, now the top-cited paper on vitamin D and COVID
GrassrootsHealth visits Capitol Hill in Washington DC to advocate for vitamin D and maternal health.
Launch of CEU-approved online course and Vitamin D Best Practices Toolkit.
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Sunny Hippocrates is our Al assistant trained exclusively on Grassroots Health research, publications, FAQs, and resources.
Click Sunny in the lower right corner anytime to start a conversation! Sunny is always here to help.
Together we can advance public health with vitamin D.
Whether you’re a scientist, healthcare professional, advocate, or someone seeking better health, GrassrootsHealth provides the research, education, testing, and community to help you make informed decisions about vitamin D for yourself, your loved ones, and your patients.
