Published on December 28, 2020

Yet another study finds a correlation between vitamin D level and COVID-19

The evidence connecting vitamin D and COVID-19 disease and severity is overwhelming. Studies have been published concluding that higher vitamin D levels are associated with more positive outcomes, from a decreased risk of testing positive to COVID-19 to a decreased risk of severity and death. In our last post, we shared a short video showing that 70-80% of COVID-19 patients with low vitamin D required admission to the ICU.

There are several important roles vitamin D plays in regulating the immune response, and its effectiveness specifically in regard to viral upper respiratory infections has been well noted. The evidence keeps piling up. Below we review yet another study that demonstrates the importance of vitamin D levels in the immune response to COVID-19.

82% of Hospitalized COVID-19 Patients had Vitamin D Deficiency

A study by Hernandez et al. looked at vitamin D levels among 216 adult hospitalized COVID-19 patients and compared them to levels of 197 matched healthy controls. Of the 216 COVID-19 patients, 19 (8.8%) of them were on vitamin D supplementation, and their data was analyzed separately.

Click to Enlarge & Print

The distribution of vitamin D levels among each group are illustrated in the chart above. The average vitamin D level among the COVID-19 patients upon admission to the hospital was 14 ng/ml (35 nmol/L) with 82% having vitamin D levels below 20 ng/ml (50 nmol/L), and an average of 21 ng/ml (52 nmol/L) among healthy controls, with only 47% below 20 ng/ml (p<0.0001).

Shorter Hospital Stays and Fewer Interventions Needed with Vitamin D

Among the COVID-19 patients who were taking vitamin D supplementation, most were women and had a greater prevalence of hypertension and immunosuppression. Even so, when compared to the COVID-19 patients who were not on vitamin D supplementation, those taking vitamin D had significantly lower rates of ICU admission, as well as an overall lower percent of combined severity and shorter length of hospital stay (although these findings were not statistically significant).

In addition, when outcomes among patients whose vitamin D level was 20 ng/ml (50 nmol/L) or higher were compared to those with levels below 20 ng/ml, the patients with higher vitamin D levels had better PaO2/FIO2 ratios (used to measure severity of Acute Respiratory Distress Syndrome; p=0.034), had less frequent radiological progression (indicating fluid build-up in the lungs; p=0.037), were less likely to require medication (p=0.032) or be admitted to the ICU (p=0.048), and were more likely to have a shorter hospital stay (p=0.002).

Don’t Blindly Supplement – Test Your Vitamin D Level Today!

By joining the GrassrootsHealth projects, you are not only contributing valuable information to our study, but 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. Do you know what your status of vitamin D, omega-3s, and other essential nutrients is? Could your levels be improved? Test now to find out!

We now have a NEW GIFTING SERVICE that allows you to quickly send ‘Gift Cards’ to friends, family and coworkers who you consider might need immediate access to testing, and to Claim the Joy of Your Health TODAY. Give the gift today!

What does the Research Say about Vitamin D & COVID-19?

It’s TIME to start saving lives! If you can help PREVENT the majority of the death, it’s time! What’s it costing you/us not to take action NOW?

There is much published research that supports a clear link between vitamin D and COVID-19 showing that higher vitamin D levels are related to:

a decreased risk of testing positive for COVID-19

increased viral SARS-CoV-2 RNA clearance

better clinical outcomes among patients with COVID-19

less severe COVID-19 disease

decreased risk of death due to COVID-19

Be sure to educate yourself on the benefits and importance of vitamin D for immune health, and take steps to ensure you and your loved ones are getting enough.

You can review all of the COVID-19 and immune health information we have shared on this page.

What Does it Take YOU to Get Your D to 40 ng/ml (100 nmol/L)?

Did you know your health could be greatly affected by making sure you have a vitamin D level of at least 40 ng/ml (100 nmol/L)? Help us help you.

STEP 1 - Do you know what your vitamin D level is? If not, be sure to test today to find out.

STEP 2 – Determine your target level. Are you at your target level? Experts recommend a level of at least 40-60 ng/ml (100-150 nmol/L).

STEP 3 – Need to boost your level? Use the D*calculator to see how much vitamin D it may take to reach your target. Opt for the Loading Dose for a quicker boost.

STEP 4 – Optimize how your body absorbs and utilizes vitamin D with co-nutrients and these simple steps.

STEP 5 – Re-Test! This is an important step to make sure you have reached your target level, and to ensure you are not taking too much! Re-testing after 3-4 months is recommended.

STEP 6 – Adjust, Repeat…

Give your immune system the nutrients it needs to support a healthy you and protect yourself from unnecessary diseases, especially COVID-19.


The first Randomized Controlled Trial on vitamin D and COVID-19 has shown a 96% lower risk of ICU admission for those receiving vitamin D (as 25(OH)D to quickly boost vitamin D blood levels) along with the standard treatment, compared to those receiving standard treatment alone.

These results support many previous observational studies showing a relationship between vitamin D levels and intake and COVID-19 severity.

Review the Latest Nutrient Research for COVID-19

GrassrootsHealth Nutrient Research Institute has launched the new Immune Boost project with the use of our myData-myAnswers nutrient health system that nearly 15,000 people are already using for their health. Specific markers that influence immune health are suggested for testing as part of this project including:

  • Vitamin D
  • Omega-3 Index
  • Essential elements magnesium, selenium, and zinc
  • hsCRP

Our goal is to demonstrate how one can use the Nutrient Research Model established by Dr. Robert Heaney to show the effect of vitamin D serum levels of at least 40 ng/ml (100 nmol/L) on risk reduction for all ethnicities in the population. Status and intake of other nutrients will also be analyzed for any type of relationship to immune status and symptom severity. Join the project today!

Please let us know if you're interested in helping sponsor this project.

CLICK HERE for updates and new information about the project.

Through GrassrootsHealth Nutrient Research Institute, you can also test your essential elements magnesium, copper, zinc and selenium, toxins such as lead, mercury and cadmium, as well as your omega-3 levels, inflammation levels and thyroid stimulating hormone (TSH) level. Find out your levels today! Log on to the test selection page (click the link below) to get your tests and see for yourself if your levels can be improved.

Make sure you track your results before and after, about every 6 months!

Click Here to Access the Test Page

How can I track my nutrient intake and levels over time?

To help you track your supplement use and nutrient levels, GrassrootsHealth has created the Personal Health Nutrient Decision System called

For each specific supplement, you can track what days you take it, how much, and many other details.  This will help you know your true supplemental intake and what patterns of use work for you to reach and maintain optimum nutrient levels. Check it out today!