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Published on September 3, 2024

Watch this video interview between Dr. Sunil Wimalawansa and Dr. Mobeen Syed as they discuss key aspects of vitamin D and how vitamin D deficiency negatively impacts our health

Key Points

  • Dr. Sunil Wimalawansa’s research with vitamin D began in the early 1980s, when he showed that adding a certain amount of vitamin D can prevent cancer cell growth and revert cells back towards stability
  • In this video interview, Dr. Wimalawansa discusses the safety of vitamin D and the levels needed to help prevent various diseases, as well as who may be at higher risk of deficiency and therefore who may need higher doses of vitamin D
  • Optimal vitamin D levels are essential for optimal functioning of all immune cells; without enough vitamin D, immune cell function is inhibited and disease risk becomes much higher

Measure Your Vitamin D Level


In today’s featured video, Dr. Mobeen Syed of Drbeen Medical Lectures interviews Dr. Sunil Wimalawansa about the key fundamental concepts of vitamin D.

Dr. Wimalawansa has been researching vitamin D for over four decades and is considered one of the world’s leading experts on vitamin D. His extensive background includes working with vitamin D in the laboratory setting from 1983, applying his vitamin D knowledge working with patients as a medical doctor, and facilitating clinical trials involving vitamin D.  He recently collaborated with GrassrootsHealth on a 5-part interview series called “Everything You Need to Know About Vitamin D… and More.”  The video interview below touches on some of these same concepts.

Watch the video on Dr. Wimalawansa’s YouTube channel below, and be sure to check out the other amazing videos provided by Dr. Mobeen Syed as well!

Watch the Video

Key Points from the Interview

Dr. Sunil Wimalawansa has been in research for almost 45 years, beginning his work with vitamin D back in 1982

His initial research was on the effects of vitamin D (as calcitriol) on cancer cell lines – he showed that adding a certain amount of vitamin D can prevent cancer cell growth and revert cells back towards stability

Vitamin D is both a vitamin and a hormone, depending on the molecule and its function of use; the hormonal activity of vitamin D is only one aspect of its functionality

Vitamin D can be made in the skin upon exposure to UVB from sunlight, but only under certain circumstances; darker skin needs much more time in the sun than lighter skin to make the same amount of vitamin D

Dr. Wimalawansa discusses the differences between vitamins D2 and D3

The idea that skin exposure to the sun is the cause of melanoma is absolutely incorrect; there is a protective effect of sun and vitamin D on melanoma

Vitamin D has tremendous benefits on the immune system, including helping it generate large amounts of antimicrobial peptides; vitamin D deficiency can contribute to the development of many diseases and acute infections

Dr. Wimalawansa discusses the safety of vitamin D and the levels needed to help prevent various diseases, as well as who may be at higher risk of deficiency and therefore who may need higher doses of vitamin D

Vitamin D is NOT stored in fat for later use…

Important cofactors of vitamin D include magnesium, vitamin K2, omega-3s, and resveratrol – it is important to make sure you are getting enough of each along with vitamin D

Dr. Wimalawansa describes the difference between the endocrine or hormonal effects and the para autocrine effects of vitamin D (calcitriol)

Click to Enlarge & Print

Optimal vitamin D levels are essential for optimal functioning of all immune cells; without enough vitamin D, immune cell function is inhibited


Measure Your Levels of Vitamin D, Magnesium, and Other Important Nutrients and Markers

Having and maintaining healthy vitamin D, magnesium, omega-3s, zinc and other nutrient levels can help improve your health now and for your future. Choose which to measure, such as your vitamin D, omega-3s, and essential minerals including magnesium and zinc, by creating your custom home test kit today. Take steps to improve the status of each of these measurements to benefit your overall health. You can also track your own intakes, symptoms and results to see what works best for YOU.

Enroll and test your levels today, learn what steps to take to improve your status of vitamin D (see below) and other nutrients and blood markers, and take action! By enrolling in the GrassrootsHealth projects, you are not only contributing valuable information to everyone, you are also gaining knowledge about how you could improve your own health through measuring and tracking your nutrient status, and educating yourself on how to improve it.

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!

BLACK FRIDAY SALE! 20% off all orders! Use code: BF24. Sale ends Monday 12/2/24 at 11:59 PM PST. Offer does not apply to the T1D Prevention Test Kit.

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