Published on September 3, 2021

September is Prostate Cancer Awareness Month. Share the awareness of vitamin D for prostate cancer!

One out of seven men will get prostate cancer in their lifetime. Since it is prostate cancer awareness month, we wanted to take the opportunity to remind everyone about research findings on vitamin D and prostate cancer.

Vitamin D has known anticancer effects, and much research has been published over the last several decades showing a link between vitamin D levels and cancer risk. Depending on the type of cancer, vitamin D alone can potentially reduce the risk of cancer by about 25% to 80%!

Findings on Vitamin D and Prostate Cancer

Dr. Bruce Hollis, a GrassrootsHealth scientist panel member, was one of the first to study giving “larger” doses of vitamin D (4,000 IU per day) to participants, something that was difficult to get approval for before 2010. (He was the first to get permission to give 4,000 IU/day for research back in 2007.)

Hollis and colleagues ran an intervention study at the Medical University of South Carolina (MUSC) on 52 men who had been diagnosed with stage 1 prostate cancer. They purposely did not conduct an RCT as they wished to give everyone in the study vitamin D. They used a dose of 4,000 IU/day of vitamin D for one full year while the participants were on a “wait and see” approach with their cancer.

In the video below, Dr. Hollis describes the study and its findings in detail.

Watch Now

The overall result was that almost 60% had a reduction in tumors (but no change to prostate-specific antigen) as opposed to doing nothing (they compared against non-participants and historical data).

Of the 52 men, 15 (29%) went from a Gleason score of 6 (stage 1 or 2 cancer) to a Gleason score of 0 (no cancer cells detected).

Is 4000 IU/day the right amount for you?

In considering differences by race, the chart below shows that while African Americans started with a vitamin D level of about half the value of Caucasians, after a year of taking 4,000 IU/day both race groups reached roughly the same vitamin D level (a mean of 60 ng/ml or 150 nmol/L).

Click to Enlarge & Print

An important note to take away from the chart is that at the 12 month mark, while the mean vitamin D level was 60 ng/ml (150 nmol/L), there is a wide range of resulting levels after supplementing with 4,000 IU per day. There is one as low as 38 ng/ml (95 nmol/L) and one near 95 ng/ml (237 nmol/L). This is another reminder of the wide variability in how each person responds to vitamin D supplementation, and especially, the importance of testing your level and focusing on the serum level rather than the dose as the appropriate biological marker.

What is Your Vitamin D Level?

Having and maintaining healthy vitamin D levels 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.

Help everyone Move Research into Practice with vitamin D and other nutrients! As a special birthday gift to everyone, in honor of the science, we have created a special scholarship fund for anyone to donate to that will go towards helping others participate. Your donation will allow anyone to get help with funding their participation when they need it.

Text-to-give: Text Daction to 44321 to add to our Scholarship Fund.

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!