
Breast Cancer Prevention Brochure
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
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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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Take the quiz to see if you have a high risk of low vitamin D levels.
A membership-based collaborative online community where researchers, practitioners, policy makers, advocates, and individuals can connect, learn, and take action.
Optimize your health with accurate testing and personalized protocols.

Join the world's largest vitamin D research study while tracking your own vitamin D status.

Monitor your vitamin D level with a convenient home test kit—no study enrollment required.
Interested in measuring more than vitamin D?
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.
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.
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
Explore research and resources by health condition.
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.
YEARS OF RESEARCH
Since 2007
COUNTRIES
Represented
STUDY PARTICIPANTS
And growing every day
SCIENTIFIC EXPERTS
Worldwide collaborators
Stay informed with the latest Vitamin D research, scientific discoveries, health insights, and community updates from GrassrootsHealth and leading experts around the world.

With more than 321,000 invasive breast cancer diagnoses expected in 2026, research suggesting vitamin D status may be an overlooked opportunity for prevention. Key Points

GrassrootsHealth and the Helen Knoll Foundation launch a joint fundraising campaign to expand access to prevention education, vitamin D testing, and practical resources for lifelong

Awareness matters when it translates into action. What actions can be taken to help prevent breast cancer? Key Points October is Breast Cancer Prevention Month
Join us to learn more from the experts, get your questions answered, hear the latest research, and collaborate with our advocacy and outreach teams.
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Tuesday, May 20, 2005-100 PM ST
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Tuesday, June 10,2025 12:00 PM
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Tuesday, June 24, 2025, at 1:00 PM ET
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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.