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Published on March 18, 2025

A video presentation and interview with Dr. William Grant

 

In this insightful two-part video, Dr. William B. Grant, a leading researcher on vitamin D, breaks down the latest research findings from 2024 on vitamin D and its role in disease prevention and outcomes. He also examines how past recommendations and study methods have influenced public understanding of vitamin D and hindered the translation of research into practice, and highlights what to look at to make your own interpretations and decisions about the research.

Following his presentation, Dr. Grant is interviewed by Jen Aliano, Director of GrassrootsHealth, to further clarify key points from the research and how it should be interpreted.

Watch the Video

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Key chapters in the video:

(00:00 – 00:08) Dr. William B. Grant’s Background

(00:09 – 00:24) Research Focus on Vitamin D and UVB Exposure

(00:25 – 01:15) Overview of Presentation Topics

(01:16 – 02:22) Vitamin D as a Vitamin and Hormone

(02:23 – 03:52) Importance of Vitamin D Research

(03:53 – 05:00) The Disinformation Playbook

(05:01 – 07:10) History of U.S. Vitamin D Recommendations

(07:11 – 10:18) Flaws in Randomized Controlled Trials (RCTs)

(10:19 – 12:45) Prospective Cohort Studies vs. RCTs

(12:46 – 16:50) Vitamin D’s Impact on Disease Prevention

(16:51 – 19:22) Recommended Vitamin D Levels and Intake

(19:23 – 21:09) Vitamin D Benefits for Leading Causes of Death

(21:10 – 23:37) Criticism and Resistance from Medical Organizations

(23:38 – 29:43) Conclusion and Call for Independent Research

(29:44 – 54:36) Questions and Answers

 

How Are Your Levels of Vitamin D and Other Important Nutrients?

Check your vitamin D, omega-3s, magnesium, and other important markers today as part of the vitamin D*action project!

Measure your:

  • Vitamin D
  • Magnesium PLUS Elements (including zinc, copper, selenium, mercury, cadmium and lead)
  • Omega-3 Fatty Acids
  • hsCRP (for Inflammation)
  • HbA1c (for Blood Sugar)
  • and more

Did you know that each of the above can be measured at home using a simple blood spot test? As part of our ongoing research project, you can order your home blood spot test kit to get your levels, followed by education and steps to take to help you reach your optimal target levels. Start by enrolling and ordering your kit to measure each of the above important markers, and make sure you are getting enough of each to support better health and wellbeing!

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How Can You Use this Information for YOUR Health?

Having and maintaining healthy vitamin D and other nutrient levels can help improve your health now and for your future. Measuring is the only way to make sure you are getting enough!

STEP 1 Order your at-home blood spot test kit to measure vitamin D and other nutrients of concern to you, such as omega-3s, magnesium, essential and toxic elements (zinc, copper, selenium, lead, cadmium, mercury); include hsCRP as a marker of inflammation or HbA1c for blood sugar health

STEP 2 Answer the online questionnaire as part of the GrassrootsHealth study

STEP 3 Using our educational materials and tools (such as our dose calculators), assess your results to determine if you are in your desired target range or if actions should be taken to get there

STEP 4 After 3-6 months of implementing your changes, re-test to see if you have achieved your target level(s)

Enroll in D*action and Build Your Custom Test Kit!