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Vitamin D Test

Vitamin D Test by Thorne offers an at-home collection kit. Meaningful insights. Personalized plan.

Test taker must be 18+ and reside in the U.S.

HSA / FSA accepted

Physical kits not available in:

  • Armed Forces Americas
  • Armed Forces Europe
  • Armed Forces Pacific
  • American Samoa
  • Maryland
  • Northern Mariana Islands
  • New Jersey
  • New York
  • Rhode Island
  • United States Minor Outlying Island


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Vitamin D Test

A low level of vitamin D is linked to various health risks. This at-home blood Vitamin D Test by Thorne will provide health insights by measuring your level of vitamin D. Results include a personalized health plan.

You should take this Vitamin D Test if you

  • Do not get daily sun exposure or live in a northern latitude
  • Do not consume adequate vitamin D
  • Follow a strict vegan diet
  • Have darker-pigmented skin
  • Have issues with small intestine absorption or kidney function
  • Are an athlete
  • Are overweight or obese
  • Are elderly

What you’ll discover


Your personal biomarker values are displayed on an easy-to-read dashboard with descriptions of what each biomarker value means for you.


Using your biomarkers, we provide detailed insights to help identify potential health risks or specific areas of improvement. Insights are generated using Thorne’s Health Intelligence platform.

Improvement Plan  

Based on your unique Vitamin D Test results, a comprehensive improvement plan with diet, activity, and supplement recommendations is generated.


What we measure

Vitamin D   •  Blood Spot

Vitamin D is a fat-soluble vitamin that we obtain from some foods and nutritional supplements, or make in our bodies after exposure to sun. Vitamin D is important for bone health, immune function, heart health, mood, brain health, and metabolic health. Vitamin D

How it works

1   •   Order and activate  

After your purchase is complete, everything you need for your at-home Vitamin D Test is delivered to your door. Use the activation code located on the back of the test kit to activate your Vitamin D Test on thorne.com and complete your health profile.

2   •   Collect samples and send  

Referencing the directions booklet included in your test kit, complete your sample collection from the comfort of your home. Use the prepaid shipper to mail your samples directly to the laboratory.

3   •   Receive results and recommendations  

Your Vitamin D Test results will be reviewed by an independent, board-certified physician. Once you’ve sent your samples to the lab, after 8-10 business days you will receive your results with meaningful insights and personalized recommendations by one of our health coach professionals to promote your health and wellness.

Potential Indicators

Although having a low level of vitamin D is often asymptomatic, you might experience:

  • More frequent infections
  • Fatigue
  • Muscle or bone discomfort
  • Depressed mood

If you have any of the following symptoms that are, or can be, associated with a vitamin D deficiency, then you should consult with your health-care practitioner:

  • Muscle spasms and twitching (which can be anywhere but are more common in the face and around the mouth or eyes)
  • Generalized weakness
  • Loss of balance/falling
  • Severe bone and joint pain ‐ hip pain is most common
  • Unexplained fracture
  • An onset of seizures
  • Abnormal heart rate or rhythm
  • High blood pressure

Potential signs and symptoms of high vitamin D
Although having a vitamin D level that is too high can be asymptomatic, with a very high level (usually a result of excess calcium absorption) you could experience:

  • Anorexia/loss of appetite
  • Vomiting
  • Diarrhea and/or constipation
  • Excessive thirst, dry mouth
  • Frequent urination
  • Fatigue
  • Dizziness
  • Muscle cramping/pain/twitching
  • Bone pain
  • Nerve pain (neuropathy)
  • Kidney stones
  • Confusion and weakness
  • Chest pain, irregular heartbeat
  • Elevated blood pressure
  • Headaches
  • Cough, shortness of breath

If you suspect you might have an excess level of vitamin D (which only occurs with excessive supplementation and is very uncommon), then you should consult with your health-care practitioner.

Vitamin D Test 101

What is Vitamin D

Vitamin D is a fat-soluble “vitamin” ‐ in quotes because it is not technically a vitamin because it can be made in the body when the skin is exposed to sunlight. Vitamin D comes in two forms ‐ D2 and D3. Vitamin D3 includes the amount derived from internal production after your skin is exposed to sunlight, as well as the amount derived from diet and supplementation.

Vitamin D2 reflects only what is acquired in the diet or from supplementation but cannot be made in the body. Together, these two biomarkers make up an individual’s total vitamin D.

Vitamin D3 is found in significant amounts in only a few foods ‐ primarily fish (especially wild caught salmon and fresh herring). Although it is found primarily in “animal sources,” vitamin D3 can also be found in algae. Some foods are fortified with vitamin D3, such as milk, orange juice, and cereals.

Vitamin D2 is primarily found in mushrooms grown in a lighted environment. Because of the limited number of foods that vitamin D is found in, supplementation is often necessary to prevent or correct a deficiency. Your Vitamin D Test level enables you to know if your body has the optimal level of this important vitamin.

How this biomarker impacts your health

It is estimated that at least 42 percent of U.S. adults have a sub-optimal vitamin D level.

Vitamin D, which is measured as 25-hydroxyvitamin D (25OH-D), is a fat-soluble vitamin that is responsible for multiple biological processes. Vitamin D, which has always been known for its capacity to support the absorption of calcium, has more recently been found to support immune function, a healthy inflammatory response, and muscle function.

A low vitamin D level is associated with a higher risk for various chronic health concerns, including osteoporosis, muscle wasting (sarcopenia), heart disease, and diabetes.

Unlike vitamins that must be acquired from outside sources, humans can make vitamin D in their skin following adequate exposure to sunlight ‐ hence its nickname, the “sunshine vitamin.” However, because we do not get as much sunlight as our ancestors, and because we might not consume adequate dietary sources of vitamin D, many individuals are at risk for insufficient or deficient vitamin D.

A too high level of vitamin D can also occur, but this is much less common and is nearly always associated with excessive supplementation.

Thorne’s Vitamin D Test measures total vitamin D, which includes the two common forms of vitamin D ‐ D2 (25OH-D2) and D3 (25OH-D3).

A healthy vitamin D level can be crucial for optimal athletic performance, bone repair after exercise or injury, normal muscle function, healthy immune function, and cardiovascular health. Therefore, it is widely accepted that athletes, compared to non-athletes, should strive to maintain a higher than sufficient level of vitamin D.

Vitamin D is also essential for healthy aging. Low levels not only contribute to bone thinning, but also muscle wasting and increased incidence of falls in the elderly.



Our Mission

We believe personalized, scientific wellness can extend the duration of one's health span, create happier and healthier lives, and feel one’s best at every age and life stage. Our ambition is to empower individuals to live healthier for longer through personalized, scientific testing and solutions. With a deep portfolio of personalized offerings – testing that provides individualized data, educational resources, and products that support specific health goals and needs – Thorne is here at every age and life stage. Thorne is redefining what it means to live healthier for longer.

How we know our supplements work

At Thorne, being able to rely on the safety and efficacy of our nutritional supplement products is the motivating force behind our clinical trials program. Our confidence that each product we formulate and manufacture works in the body comes from extensive clinical research and medical literature that substantiate the presence of each ingredient in each formula. In addition to confirming the safety of our products, clinical research helps us better understand their efficacy. And it paves the way for new discoveries. The ultimate goal of our research partnerships is to help us fulfill our mission of solving the biggest challenges in health and wellness.
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