Published on November 27, 2020

This one-page infographic has all the basic information anyone needs to get started with vitamin D – share it today!

Have you ever felt like you wanted to tell someone about vitamin D but didn’t know where to start? Or what information to give them that was most important?

GrassrootsHealth, along with some of the top vitamin D researchers in the world, have put together the infographic below to present an easy-to-comprehend visual handout to get anyone started on vitamin D.

Click to Enlarge & Download

What is so important about this information?

One of the most important messages conveyed with this graphic is that simply taking a vitamin D supplement may not be providing enough vitamin D, especially when the current medical recommendations are too low for almost all people.

Recommended intakes for vitamin D are 400-800 IU/d from government agencies in US, Canada and UK, but to reach a target level of 40-60 ng/ml may take up to ten times as much and taking 4000 IU a day is considered safe for every adult.

An intake of 400 to 800 IU of vitamin D per day, especially during the winter when many people are stuck indoors, is certainly not enough vitamin D to support the levels needed for maintaining your health! Obvious consequences of such low recommendations are the current average vitamin D levels among the general population, such as a level of 26 ng/ml for the United States. Vitamin D scientists recommend maintaining a vitamin D level of 40-60 ng/ml (100-150 nmol/L) however, the amount needed for one person to achieve such levels may be much different than the amount needed for others.

Who May Need More Vitamin D and When?

  • people with dark skin
  • higher body weight (overweight and obese)
  • indoor and night-shift workers
  • cover body with clothing when outdoors
  • live north of 44°N latitude (north of Kansas)
  • during winter months

What Causes The Difference?

  • how much time you spend in the summer sun
  • genetics and age
  • digestion problems (such as irritable bowel syndrome)
  • medication (such as prednisone)
  • lack of co-factors such as magnesium, vitamin K2, calcium and vitamin C
  • taking supplements without a meal

How to Know You’re Getting Enough Vitamin D

The only way to make sure that your target level of vitamin D has been reached is to measure the amount of vitamin D [as 25(OH)D] in your blood. If your resulting level is below your target, using the vitamin D calculator to help determine a new supplementation amount along with information provided on how to support and maintain a healthy vitamin D level (such as with co-nutrients, sun exposure, and food). Re-testing after 3 to 6 months allows you to ensure your target has been reached, or gives you the opportunity to adjust your routine as needed.

Don’t Allow a Vitamin D Deficiency to Bring Your Health Down!

Correcting a vitamin D deficiency prior to getting sick may decrease disease severity and improve outcomes! Test your vitamin D level today, learn what steps to take to improve your level, and take action to achieve and maintain a vitamin D level of 40-60 ng/ml (100-150 nmol/L).

Using the GrassrootsHealth Custom Kit Builder, you can create a test kit that measures your status of vitamin D and other important nutrients (such as omega-3s, zinc and magnesium), as well as your CRP level to measure inflammation. Click here to build and order your test kit today – measure your status and take the steps necessary to improve them if needed; make an impact on your health today and for your future! When you know what your levels are, you can determine next steps to take and how much supplementation may be needed if you are not at your target levels.

Enroll now with the Full Immune Boost Panel (which includes tests for vitamin D, Omega-3 Index, magnesium, zinc, selenium, copper, and hsCRP), and get 10% off when you use coupon code BoostTen at checkout.

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!