Vitamin D Research & Published Studies

Our Research

Below are research papers published using data from our vitamin D replete community (average serum levels of over 40 ng/ml vs. the general population’s 25 ng/ml) and papers published by GrassrootsHealth in association with other scientists in the field. Find more published research and preliminary data from our cohort.

Evidence that Vitamin D Supplementation Could Reduce Risk of Influenza and COVID-19 Infections and Deaths (April 2020)

William B Grant

et al. Nutrients

April 2020

Cross-sectional study of the combined associations of dietary and supplemental eicosapentaenoic acid + docosahexaenoic acid on Omega-3 Index (Sept 2019)

Sharon L. McDonnell

MPH et al. Nutrition Research

September 2019

25-Hydroxyvitamin D variability withinperson due to diurnal rhythm and illness: a case report (Jan 2019)

Christine B. French

J Med Case Rep.

January 2019

Breast cancer risk markedly lower with serum 25-hydroxyvitamin D concentrations ≥ 60 vs < 20 ng/ml (150 vs 50 nmol/L): Pooled analysis of two randomized trials and a prospective cohort (Jun 2018)

Sharon L. McDonnell

MPH et al. PLOS One

June 2018

Maternal 25(OH)D concentrations ≥40 ng/mL associated with 60% lower preterm birth risk among general obstetrical patients at an urban medical center (Jul 2017)

Sharon L. McDonnell

MPH et al. PLOS One

July 2017

Serum levels greater than 40 ng/ml are associated with > 65% lower risk of cancer. (Apr 2016)

Sharon L. McDonnell

MPH et al. PLOS One

April 2016

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 (Oct 2016)

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

Carol Wagner

et al. Medical University of South Carolina

November 2015

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 (Jul 2015)

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

Sharon L. McDonnell, MPH

et al. The Journal of Steroid Biochemistry and Molecular Biology

July, 2015

Sunlight and Vitamin D: Necessary for Public Health (Jun 2015)

Carole A. Baggerly, BA

et al. Journal of the American College of Nutrition

June, 2015

Letter to Veugelers, P.J. and Ekwaru, J.P., A Statistical Error in the Estimation of the Recommended Dietary Allowance for Vitamin D (Mar 2015)

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

Robert Heaney, MD

et al. Nutrients

March 2015

Post-Hoc Comparison of Vitamin D Status at Three Time Points During Pregnancy Demonstrates Lower Risk of Preterm Birth with Higher Vitamin D Closer to Delivery (Nov 2014)

25(OH)D values closer to delivery were more strongly correlated with gestational age at delivery than earlier values.

Carol L. Wagner, MD

et al. Journal of Steroid Biochemistry & Molecular Biology

November, 2014

Meta-Analysis of All-Cause Mortality According to Serum 25-Hydroxyvitamin D (Aug 2014)

Serum 25(OH)D concentrations less than or equal to 30 ng/mL were associated with higher all-cause mortality than concentrations greater than 30 ng/mL.

Cedric F. Garland, DrPH

et al. American Journal of Public Health

August 2014

25(OH)D Serum Levels May Provide Additional Reduction in Breast Cancer Risk (Apr 2014)

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

Sharon L. McDonnell, MPH

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

April 2014

Quantifying the food sources of basal vitamin D input. (Nov 2013)

Sharon L. McDonnell, MPH

et al. Journal of Steroid Biochemistry and Molecular Biology

November 2013

Quantifying the non-food sources of basal vitamin D input. (Nov 2013)

Sharon L. McDonnell, MPH

et al. Journal of Steroid Biochemistry and Molecular Biology

November 2013

25-Hydroxyvitamin D in the Range of 20 to 100 ng/ml and Incidence of Kidney Stones (Oct 2013)

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

Stacie Nguyen, MPH

et al. American Journal of Public Health

October 2013

A Novel Approach Localizes the Association of Vitamin D Status With Insulin Resistance to One Region of the 25-Hydroxyvitamin D Continuum (May 2013)

Study finds vitamin D status is inversely associated with insulin responsiveness and blood pressure.

Robert P. Heaney, MD

et al. Advances in Nutrition

May 2013

All-Source Basal Vitamin D Inputs are Greater Than Previously Thought and Cutaneous Inputs are Smaller (Mar 2013)

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

Robert P. Heaney, MD

et al. The Journal of Nutrition

March 2013

Vitamin D Supplement Doses and Serum 25-Hydroxyvitamin D in the Range Associated with Cancer Prevention (Jan 2011)

Cedric F. Garland, Dr PH FACE

et al. Anticancer Research

January 2011

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Our Research

Evidence that Vitamin D Supplementation Could Reduce Risk of Influenza and COVID-19 Infections and Deaths (April 2020)

Cross-sectional study of the combined associations of dietary and supplemental eicosapentaenoic acid + docosahexaenoic acid on Omega-3 Index (Sept 2019)

25-Hydroxyvitamin D variability withinperson due to diurnal rhythm and illness: a case report (Jan 2019)

Breast cancer risk markedly lower with serum 25-hydroxyvitamin D concentrations ≥ 60 vs < 20 ng/ml (150 vs 50 nmol/L): Pooled analysis of two randomized trials and a prospective cohort (Jun 2018)

Maternal 25(OH)D concentrations ≥40 ng/mL associated with 60% lower preterm birth risk among general obstetrical patients at an urban medical center (Jul 2017)

Serum levels greater than 40 ng/ml are associated with > 65% lower risk of cancer. (Apr 2016)

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 (Oct 2016)

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 (Jul 2015)

Sunlight and Vitamin D: Necessary for Public Health (Jun 2015)

Letter to Veugelers, P.J. and Ekwaru, J.P., A Statistical Error in the Estimation of the Recommended Dietary Allowance for Vitamin D (Mar 2015)

Post-Hoc Comparison of Vitamin D Status at Three Time Points During Pregnancy Demonstrates Lower Risk of Preterm Birth with Higher Vitamin D Closer to Delivery (Nov 2014)

Meta-Analysis of All-Cause Mortality According to Serum 25-Hydroxyvitamin D (Aug 2014)

25(OH)D Serum Levels May Provide Additional Reduction in Breast Cancer Risk (Apr 2014)

Quantifying the food sources of basal vitamin D input. (Nov 2013)

Quantifying the non-food sources of basal vitamin D input. (Nov 2013)

25-Hydroxyvitamin D in the Range of 20 to 100 ng/ml and Incidence of Kidney Stones (Oct 2013)

A Novel Approach Localizes the Association of Vitamin D Status With Insulin Resistance to One Region of the 25-Hydroxyvitamin D Continuum (May 2013)

All-Source Basal Vitamin D Inputs are Greater Than Previously Thought and Cutaneous Inputs are Smaller (Mar 2013)

Vitamin D Supplement Doses and Serum 25-Hydroxyvitamin D in the Range Associated with Cancer Prevention (Jan 2011)

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Our Research

Evidence that Vitamin D Supplementation Could Reduce Risk of Influenza and COVID-19 Infections and Deaths (April 2020)

Cross-sectional study of the combined associations of dietary and supplemental eicosapentaenoic acid + docosahexaenoic acid on Omega-3 Index (Sept 2019)

25-Hydroxyvitamin D variability withinperson due to diurnal rhythm and illness: a case report (Jan 2019)

Breast cancer risk markedly lower with serum 25-hydroxyvitamin D concentrations ≥ 60 vs < 20 ng/ml (150 vs 50 nmol/L): Pooled analysis of two randomized trials and a prospective cohort (Jun 2018)

Maternal 25(OH)D concentrations ≥40 ng/mL associated with 60% lower preterm birth risk among general obstetrical patients at an urban medical center (Jul 2017)

Serum levels greater than 40 ng/ml are associated with > 65% lower risk of cancer. (Apr 2016)

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 (Oct 2016)

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 (Jul 2015)

Sunlight and Vitamin D: Necessary for Public Health (Jun 2015)

Letter to Veugelers, P.J. and Ekwaru, J.P., A Statistical Error in the Estimation of the Recommended Dietary Allowance for Vitamin D (Mar 2015)

Post-Hoc Comparison of Vitamin D Status at Three Time Points During Pregnancy Demonstrates Lower Risk of Preterm Birth with Higher Vitamin D Closer to Delivery (Nov 2014)

Meta-Analysis of All-Cause Mortality According to Serum 25-Hydroxyvitamin D (Aug 2014)

25(OH)D Serum Levels May Provide Additional Reduction in Breast Cancer Risk (Apr 2014)

Quantifying the food sources of basal vitamin D input. (Nov 2013)

Quantifying the non-food sources of basal vitamin D input. (Nov 2013)

25-Hydroxyvitamin D in the Range of 20 to 100 ng/ml and Incidence of Kidney Stones (Oct 2013)

A Novel Approach Localizes the Association of Vitamin D Status With Insulin Resistance to One Region of the 25-Hydroxyvitamin D Continuum (May 2013)

All-Source Basal Vitamin D Inputs are Greater Than Previously Thought and Cutaneous Inputs are Smaller (Mar 2013)

Vitamin D Supplement Doses and Serum 25-Hydroxyvitamin D in the Range Associated with Cancer Prevention (Jan 2011)

Document Topics

Address

GrassrootsHealth 315 S. Coast Hwy 101 Suite U-87 Encinitas, CA 92024

Email

Phone

(760) 579-8141

Cross-sectional study of the combined associations of dietary and supplemental eicosapentaenoic acid + docosahexaenoic acid on Omega-3 Index (Sept 2019)