Research

GrassrootsHealth’s mission is based on research, both from the vitamin D scientist community and from our D*action cohort. Below are ten research papers published using data from our vitamin D replete community (average serum level of 44 ng/ml vs. the general population’s 25 ng/ml). For more research, you will find papers associated with every condition listed in the sidebar.

Serum levels greater than 40 ng/ml are associated with > 65% lower risk of cancer.


Serum 25-Hydroxyvitamin D Concentrations ≥40 ng/ml are Associated with >65% Lower Cancer Risk: Pooled Analysis of Randomized Trial and Prospective Cohort Study


Sharon L. McDonnell

MPH et al. PLOS One

April 2016

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Serum levels greater than or equal to 40 ng/ml decrease pregnancy comorbidities.


Post-hoc Analysis of Vitamin D Status and Reduced Risk of Preterm Birth in Two Vitamin D Pregnancy Cohorts Compared with South Carolina March of Dimes 2009-2011 rates


Carol Wagner

et al. Medical University of South Carolina

October 2015

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Serum levels over 40 ng/ml are associated with a 60% lower risk of type 2 diabetes.


Incidence Rate of Type 2 Diabetes is >50% Lower in GrassrootsHealth Cohort with Median Serum 25-hydroxyvitamin D of 41 ng/ml than in NHANES Cohort with Median of 22 ng/ml


Sharon L. McDonnell, MPH

et al. The Journal of Steroid Biochemistry and Molecular Biology

July, 2015

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9600 IU/day vitamin D, from all sources, is necessary to get 97.5% of the world up to 40 ng/ml.


Letter to Veugelers, P.J. and Ekwaru, J.P., A Statistical Error in the Estimation of the Recommended Dietary Allowance for Vitamin D


Robert Heaney, MD

et al. Nutrients

March 2015

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Serum levels of 40-60 ng/ml may provide a significant reduction in breast cancer risk.


25(OH)D Serum Levels May Provide Additional Reduction in Breast Cancer Risk


Sharon L. McDonnell, MPH

et al. American Society for Nutrition Scientific Sessions and Annual Meeting

April 2014

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Quantifying the food sources of basal vitamin D input.


Quantifying the Food Sources of Basal Vitamin D Input


Sharon L. McDonnell, MPH

et al. Journal of Steroid Biochemistry and Molecular Biology

November 2013

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Quantifying the non-food sources of basal vitamin D input.


Quantifying the Non-Food Sources of Basal Vitamin D Input


Sharon L. McDonnell, MPH

et al. Journal of Steroid Biochemistry and Molecular Biology

November 2013

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Serum levels from 20-100 ng/ml have no association with kidney stones.


25-Hydroxyvitamin D in the Range of 20 to 100 ng/ml and Incidence of Kidney Stones


Stacie Nguyen, MPH

et al. American Journal of Public Health

October 2013

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Study finds basal (standard, non-supplemental) vitamin D intake approximately 2000 IU/day, not the 300 IU/day previously taught in medical school.


All-Source Basal Vitamin D Inputs are Greater Than Previously Thought and Cutaneous Inputs are Smaller


Robert P. Heaney, MD

et al. The Journal of Nutrition

March 2013

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Vitamin D Supplement Doses and Serum 25-Hydroxyvitamin D in the Range Associated with Cancer Prevention


Vitamin D Supplement Doses and Serum 25-Hydroxyvitamin D in the Range Associated with Cancer Prevention


Cedric F. Garland, Dr PH FACE

et al. Anticancer Research

2011

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