Published on April 16, 2021

Video Friday: Watch and share this excellent review of vitamin D, what it does, and how to make sure you are getting enough

It’s Video Friday! Today we feature a video by Tom Malterre, MS, CN as he reviews five big reasons why some people may not be getting the amount of vitamin D they need. He covers topics such as vitamin D basics and benefits, how vitamin D works in the body, how it can make or break our health, what happens if you don’t have enough, how to get enough, and how certain things in our environment can cause vitamin D levels to decrease. This video is educational, captivating, and easy to follow – and is a great learning opportunity to share with others!

Please take a moment to watch and share the video along with our detailed information below.

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After watching the video, be sure to make note of our added details below.

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What Could be Causing Your Vitamin D Levels to be Too Low?

Here is a quick summary of what this video discusses, along with additional information and details about vitamin D:

Why is Vitamin D Important?

Vitamin D is more than just a vitamin, it is a hormone and signaling molecule that has the ability to act on all cells of the body, and has a large role in gene expression.

Vitamin D is known as the sunshine vitamin – one way our bodies “harness the energy of the sun” for health. Vitamin D is developed in our skin upon exposure to UVB radiation under the right conditions.

When we have adequate vitamin D, it is able to tell the genes in different types of cells to make more proteins that do specific things for our health; all kinds of cells in all tissues of the human body rely on vitamin D for normal cellular function (including immune cells and musculoskeletal cells).

5 Reasons your Vitamin D is Not Rising

1) Current Recommendations are Too Low – too often people assume they are taking enough when they are not. There are several factors that affect how each individual responds to supplementation, and testing vitamin D levels is necessary to ensure adequate intake – testing at least twice per year is best to understand how personal levels fluctuate throughout the year.

2) Inadequate Sun Exposure – There are many things to be aware of when intending to get vitamin D from the sun. The amount of skin exposed, time of day, season, location, skin pigmentation, and other factors can limit vitamin D conversion in the skin. The right amount of UV Radiation Power is required to break the bond of the cholesterol in the skin that makes it into vitamin D – learn how and when to use it without burning.

3) You’re Not Absorbing it or Making it – People taking the same dose of vitamin D supplements can have huge variation in response and resulting vitamin D levels. This is called the dose-response, which is affected by several factors, including digestive health, BMI, age, genetics, and co-nutrient intake, among others. Digestive issues and absorption issues (such as with Celiac Disease, Bowel Resection/Bariatric Surgery, Upper Intestinal Tract Abnormalities) can have a major impact on vitamin D levels, so it is especially important to look at digestive health if levels are not rising as expected.

4) Medications and Chemical Interactions (BPA and Phthalates) – Certain medications and chemicals can cause a degrading of vitamin D, such as BPAs and phthalates.

5) Eating Problematic Foods – Ingestion of foods that contain high fructose corn syrup, or foods with chlorine-based herbicides and pesticides, have been linked to reduced vitamin D levels. Some studies have shown that high fructose corn syrup can lower vitamin D levels and inhibit intestinal calcium absorption, among other problems.

Bonus Information on Vitamin K – What does vitamin K do, and how does it relate to vitamin D? While some people may want to consider taking vitamin K with vitamin D, is it necessary for everyone to take an additional vitamin K supplement?

Are You Getting Enough Vitamin D for Your Health?

With almost 90% of the general population having vitamin D levels below the recommended 40-60 ng/ml (100-150 nmol/L), it is obvious that most people need more vitamin D. While most of us cannot achieve a vitamin D level of 40-60 ng/ml from sun alone, either due to our lifestyle, where we live, or other circumstances, we can certainly reach those levels with the right amount of supplementation.

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.

Click to Enlarge & Print

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!