Published on January 12, 2026
Get 15% off your test kit order and get the vitamin D & COVID-19 research summary eBook free this week of January, for National Stay Healthy Month.
Every January, we celebrate “National Staying Healthy Month.” Here at GrassrootsHealth, we love to keep the focus on the importance of using measurement to gain personalized insight on simple changes anyone can prioritize to get and stay healthy. Measuring to make sure you are getting enough nutrients, especially vitamin D and omega-3s, is an easy way to help improve health and decrease the risk of many diseases, while measuring inflammation markers can help identify whether there are internal stressors that are silently hijacking your health.
For this next week only, take advantage of this special offer to measure your levels with
15% OFF HOME BLOOD SPOT TEST KITS
PLUS a FREE copy of our eBook, Vitamin D & COVID-19: A Summary of Published Research
with code HEALTHY2026
Hurry! This offer is available now until Wednesday, January 21st, 2026 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 some 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 HEALTHY2026 for 15% Off PLUS Your Free eBook
Getting Enough Vitamin D Can Truly Help Prevent Disease!
ARE YOU GETTING ENOUGH? Measure Today!
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 |
|---|---|---|
 |  |  |
ENSURE HEALTHY NUTRIENT LEVELS BY TESTING TODAY
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 Wednesday, January 21st, 2026 at 11.59PM PST. Valid on all at-home test kits from GrassrootsHealth except the T1D Prevention Test Kit; 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.
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)
