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Vitamin D Testing
from Dried Blood Spot Samples

Offer convenient Vitamin D testing to your customers with remote sample collection and certified lab analysis.

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What Is Vitamin D?

Vitamin D is a fat-soluble vitamin essential for bone health, immune defense, mood balance, and hormone regulation. It exists in two main forms — D2 (ergocalciferol) and D3 (cholecalciferol). In the body, both are converted to 25-hydroxyvitamin D [25(OH)D], which is the most reliable marker of Vitamin D status.

Bone Health

Regulates calcium and phosphorus absorption to support bone strength and prevent conditions like rickets and osteoporosis.
Immune Support

Plays a role in both innate and adaptive immunity, helping reduce infection risk and chronic inflammation.
Mood & Cognitive Function

Low Vitamin D levels are linked to increased risk of depression, anxiety, and cognitive decline.
Hormone Regulation

Vitamin D receptors are found in nearly all body tissues, influencing hormone activity and gene expression.

Why Is Vitamin D Testing Important?

  • Deficiency is common and often goes unnoticed without testing
  • Enables precise dosing of Vitamin D supplements
  • Confirms whether supplementation or lifestyle changes are working

For supplement and wellness brands, Vitamin D testing is a powerful tool to drive personalization, boost customer trust, and differentiate your product line.

What We Measure

Analytes

Vitamin D2 and Vitamin D3, including epimeric forms

Sample type

Dried blood spot (DBS)

Method

Chromatography with spectrometry

Applications

  • Integrated Testing
    Offer testing alongside your Vitamin D products to help customers understand their needs and results.
  • Supplement Validation
    Measure the before-and-after effect of your Vitamin D products with biomarker data.
  • Client Retention
    Give your customers a reason to stay engaged with your brand — testing creates trust and measurable outcomes.

FAQ

Yes. DBS testing is minimally invasive and safe for pediatric use. We also measure epimers, which is especially important in infants to ensure accurate Vitamin D results.

We recommend testing your Vitamin D levels before starting supplementation and retesting after completing a course to assess effectiveness. Deficiency is common in low-sunlight regions and often goes unnoticed, so testing is useful even if you are not taking supplements.

Yes. Our test measures 25-hydroxyvitamin D [25(OH)D], which includes both D2 and D3 metabolites for a complete and reliable assessment of Vitamin D status.

The test uses a dried blood spot (DBS) sample collection kit. A small finger-prick is all that’s needed to collect a few drops of blood onto the DBS card, following our step-by-step instructions. The sample card is about the size of a business card and can be shipped at room temperature.

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