Published on February 10, 2021

African Americans have a 15-20 fold higher prevalence of severe vitamin D deficiency, which may account for a majority of their increased health and mortality risks

Regardless of skin color, vitamin D deficiency increases the risk of many diseases, from cancer and heart disease to diabetes and autoimmune disease, and as we have seen more recently, severe cases of and death from COVID-19.

These diseases associated with vitamin D deficiency are also the same ones seen more prevalently among blacks. This makes sense with the incredibly high incidence of vitamin D deficiency and insufficiency among blacks and other people with darker skin (who need more sun exposure than people with lighter skin to make the same amount of vitamin D).

Blacks are the most deficient in vitamin D

The National Health and Nutrition Examination Survey (NHANES) measures and analyzes vitamin D levels in the United States over many years. The chart below shows data from 2013-2014 which clearly illustrates the higher rates of vitamin D deficiency among blacks compared to all other ethnicities, with approximately 80% having levels below 30 ng/ml and 95% below 40 ng/ml.

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Blacks also have much Higher Mortality Rates from diseases associated with Vitamin D Deficiency

With more blacks having vitamin D deficiency compared to whites, it should be expected to see more vitamin D deficiency related health conditions, such as cancer, diabetes, heart disease, and others – and mortality due to these conditions – among blacks compared to whites. The chart below illustrates the percent INCREASE in mortality rates for blacks compared to whites.

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Could Increasing Vitamin D Levels among Blacks Lessen the Difference?

A review by Ames et al. titled Does the High Prevalence of Vitamin D Deficiency in African Americans Contribute to Health Disparities? examined the existing research and showed that there is strong evidence that getting vitamin D levels among blacks up to at least 30-40 ng/ml (75-100 nmol/L) may eliminate much of the health disparities seen between blacks and whites. In order to see what effect vitamin D levels had on the mortality rates of blacks compared to whites, the authors created the chart below. When breaking the mortality risk down by vitamin D level, you can see that the risk of mortality for blacks is similar to the risk of mortality for whites for each category of vitamin D serum level! This indicates that correcting vitamin D deficiency and insufficiency among blacks could close the gap in mortality rates between blacks and whites.

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Regardless of Skin Color, Correcting Vitamin D Deficiency Decreases Mortality Risk

Based on the above, the risk of mortality is similar between blacks and whites when mortality is grouped by vitamin D level. Even though more blacks may be in the lower vitamin D categories, with more experiencing higher rates of all-cause mortality, their risk of mortality decreases in the same manner as whites when vitamin D levels increase. As you can see in the chart below, there is a 61% lower risk of mortality for blacks and a 50% lower risk of mortality for whites when vitamin D levels were increased from less than 10 ng/ml (25 nmol/L) to at 30 ng/ml (75 nmol/L) or above.

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One simple change can make a BIG difference!

The authors of this review conclude

“…no reason exists to delay addressing vitamin D deficiency among populations with high prevalence of deficiency such as African Americans. The potential benefits promise to be large, and much evidence indicates that the risks of supplementation up to 4000 IU per day vitamin D are minimal.”

It should be clear that vitamin D alone has the potential to make a big difference in health outcomes, for black individuals especially. What are we waiting for?

Individuals who are black, white, or of any other skin color may greatly benefit their health by checking their vitamin D level and taking the steps necessary to get their vitamin D level up to the scientists’ recommended 40-60 ng/ml (100-150 nmol/L). Take action now!

Are You Getting Enough Vitamin D?

Everyone needs vitamin D! Below is a guide for how much you might need, and who may need more. Your levels can be tested safely at home – order your home test kit today.

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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!