Published on March 24, 2024

Winter is always a time when vitamin D levels tend to drop – make sure your levels are good! Save 15% PLUS get a free copy of our Sunshine eBook when measuring your vitamin D with other important levels this week.

Spring is here, and to celebrate, we are offering 15% off home test kits on orders of $100 or more – PLUS get a FREE copy of our Sunshine eBook to help you learn more about how to safely use the sunshine to supplement your vitamin D levels and your overall health. Include other measurements such as your omega-3s, magnesium, inflammation levels and more to gain additional insight on what else could be addressed to help improve your overall health, energy, and wellbeing.


with code SPRING24

Hurry! This offer is available now until Monday, April 1st, 2024 at 11.59PM PST.*
(Offer not valid on the T1D Prevention Test Kit)


The Importance of Tracking Vitamin D Changes with Season

As the seasons change it is important to keep in mind our resulting lifestyle changes and how they affect our health. One of the most obvious changes is the amount of sun exposure we receive on a daily basis. Whether it is due to the change in the sun’s angle and the number of hours the sun is up, the increase or decrease in clothing we wear when outside, or the weather that keeps us from going outside, changes in these daily habits will have an effect on our vitamin D levels. For those of us in the Northern Hemisphere, that will most likely mean lower vitamin D and a higher chance of being deficient by the end of winter (NOW).

An analysis of almost 4,000 GrassrootsHealth participants who tested their vitamin D levels and reported that they did not take vitamin D supplements showed that vitamin D levels peaked in the month of August and declined to their lowest levels during the winter months of January through March.

Get Our Sunshine eBook FREE with Your Purchase of $100 or More!

Many of our participants tend to rely more on sun exposure for their source of vitamin D during the late spring and summer months and will therefore decrease supplementation during that time. However, this can be tricky if a few key points are not considered…

Are you planning on incorporating more sunshine into your routine this spring and summer?  With our Sunshine eBook, you will learn:

  • the health benefits of sunshine
  • what happens in our bodies when exposed to sunshine
  • how and when to make vitamin D from sun exposure and how this is different from taking a supplement
  • how to utilize sensible sun exposure to minimize the risks of sun exposure and maximize the benefits for skin and overall health
  • and more…

Get Your eBook Free with 15% Off Orders of $100 or More with Code SPRING24


Treat Yourself Right by Measuring Your Status and Taking Appropriate Action for Your Health

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

All Tests Kit

Inflammation Panel Plus Magnesium

Immune Boost Panel

Purchase Here

Purchase Here

Purchase Here

Are You Getting Enough?  Measure Today!

Measuring your levels of specific nutrients, such as vitamin D, omega-3s and magnesium, and other markers of health can offer insights on steps to take to help improve overall physical and mental health.

Research shows that the following nutrients are especially important to overall health:


  • Vitamin D is needed by virtually every cell in the body, and is essential for hundreds of processes each and every day. It acts as a protector and regulator of all cell types, tissues, and organs, it is able to enhance the functioning of each system of the body to help keep us healthy.
  • Approximately 90% of the general US population has a vitamin D level below the scientists’ recommended 40-60 ng/ml (100-150 nmol/L)


  • A lower Omega-3 Index is associated with increased risk for heart disease, loss of cognitive function, cellular aging, depression, dry eye disease, and death from all causes
  • The recommended Omega-3 Index is 8% or higher – yet 85% of GrassrootsHealth participants were below this level


  • The AA:EPA ratio and Omega-6:3 ratio are measures of pro/anti-inflammatory fatty acids; knowing these ratios can help you take more specific steps towards achieving lower levels of inflammation through diet and supplements


  • Magnesium deficiency is a contributor to health problems such as musculoskeletal pain, atrial fibrillation, stroke, heart failure, preeclampsia, bone health, mental, emotional & behavioral disorders, diabetes, and even vitamin D deficiency
  • Choose to measure additional elements such as Selenium, Zinc, Copper, Zinc:Copper Ratio and toxic elements Cadmium, Lead, and Mercury


  • Elevated CRP levels have been linked to metabolic syndrome, future heart attacks, stoke, peripheral arterial disease, and the development of diabetes


  • HbA1c is a measure of how healthy average blood sugar levels have been in the recent few months, and is a better representation of blood sugar health than a single glucose measurement
  • Higher levels of HbA1c are associated with higher levels of inflammation, a higher risk of metabolic syndrome, diabetes, and cardiovascular disease


  • Measure your TSH levels as an indicator of thyroid health


  • T1D Autoantibodies are immunologic markers of the process that can cause type 1 diabetes
  • The presence of these autoantibodies can indicate an autoimmune response against the cells of the pancreas, and is strongly associated with the development of T1D

How Are Your Levels of Important Nutrients?

Do you know what your vitamin D level is? Check yours along with omega-3s, magnesium, and other levels today as part of the vitamin D*action project; add the Ratios for more about how to balance your Omega-3s and 6s!

Measure your:

  • Vitamin D
  • Magnesium PLUS Elements
  • Omega-3 Fatty Acids
  • hsCRP (for Inflammation)
  • HbA1c (for Blood Sugar)
  • and more

Did you know that each of the above can be measured at home using a simple blood spot test? As part of our ongoing research project, you can order your home blood spot test kit to get your levels, followed by education and steps to take to help you reach your optimal target levels. Start by enrolling and ordering your kit to measure each of the above important markers, and make sure you are getting enough of each to support better mood and wellbeing!

Build your custom kit here

Start Here to Measure Your Levels

*Offer valid until Monday, April 1st, 2024 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.

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!