Published on January 25, 2023

Get 10% off any test kit order and get the vitamin D & COVID-19 research summary eBook free this last week of January, National Stay Healthy Month.

Every January, we celebrate “National Staying Healthy Month,” to bring focus back on the importance of sticking with regular activities that keep us healthy and strong, in both mind and body. Getting enough nutrients, including vitamin D and omega-3s, is an easy way to help improve health and decrease the risk of many diseases.

For this last week of January, take advantage of this special offer to measure your nutrient levels with

PLUS a FREE copy of our eBook, Vitamin D & COVID-19: A Summary of Published Research

Hurry! This offer is available now until Tuesday, January 31st, 2023 at 11.59PM PST.*


The Vitamin D & COVID-19: A Summary of Published Research eBook – A $15 Value, FREE with Promo

Vitamin D is a major and easily modifiable factor that helps reduce the incidence and severity of COVID-19.

Many studies to date have demonstrated a reduced risk of COVID-19 infection, severity, and death with increased vitamin D levels, as well as with other important nutrients.

The eBook, Vitamin D & COVID-19, A Summary of Published Research, is a condensed and concise compilation of much of the published research on vitamin D and COVID-19, easy to read and share as a downloadable, printable PDF. Your purchase helps to further public knowledge and education of this invaluable research!

Order with Code STAYHEALTHY for 10% Off PLUS Your Free eBook

Getting Enough Vitamin D Can Truly Help Prevent Disease!

What else can you test with your kit?  Measure any combination of the following along with your vitamin D:

  • Omega-3 Index, including AA:EPA and Omega-3/6 Ratios – measure your omega-3 levels with the Omega-3 Index; get additional insights on the balance of essential fats in the body and how they may be contributing to inflammation and disease by adding the ratios
  • High Sensitivity C-Reactive Protein (hs-CRP) – a marker of inflammation in the body
  • HbA1c (Glycated hemoglobin) – measures the health of recent blood sugar levels
  • Magnesium, with additional elements such as Selenium, Zinc, Copper, Zinc:Copper Ratio and toxic elements Cadmium, Lead, and Mercury
  • Thyroid Stimulating Hormone (TSH)

Build your custom kit by adding your choice of the options above, or choose from our top selling test combinations:

Vitamin D Test

Vitamin D & Omega-3 Index

Immune Boost Panel

Purchase Here

Purchase Here

Purchase Here


Having and maintaining healthy nutrient levels can help improve your health now and for your future. Choose which nutrients to measure with your vitamin D, such as your omega-3s and essential minerals including magnesium and zinc, by creating your custom home test kit today with our special offer. Take steps to improve the status of each of these measurements to benefit your overall health. With measurement you can then determine how much is needed and steps to achieve your goals. You can also track your own intakes, symptoms and results to see what works best for YOU.

*Offer valid until Tuesday, January 31st, 2023 at 11.59PM PST. Valid on all at-home test kits from GrassrootsHealth; enrollment included. Not cumulative with other coupon codes.

Take steps for your own health to ensure optimal vitamin D levels – for your family and loved ones as well – by measuring at home today.

Test Your Levels Now

How Can You Use this Information for YOUR Health?

Having and maintaining healthy vitamin D and other nutrient levels can help improve your health now and for your future. Measuring is the only way to make sure you are getting enough!

STEP 1 Order your at-home blood spot test kit to measure vitamin D and other nutrients of concern to you, such as omega-3s, magnesium, essential and toxic elements (zinc, copper, selenium, lead, cadmium, mercury); include hsCRP as a marker of inflammation or HbA1c for blood sugar health

STEP 2 Answer the online questionnaire as part of the GrassrootsHealth study

STEP 3 Using our educational materials and tools (such as our dose calculators), assess your results to determine if you are in your desired target range or if actions should be taken to get there

STEP 4 After 3-6 months of implementing your changes, re-test to see if you have achieved your target level(s)

Enroll in D*action and Build Your Custom Test Kit!