Vitamin D Status Guide
Interpret vitamin D (25-OH-D) levels with deficiency/insufficiency classification and sun/food/supplement guidance.
Inputs
Fill in the inputs and press Calculate to see your science-backed results.
How to use Vitamin D Status Guide
Interpret vitamin D (25-OH-D) levels with deficiency/insufficiency classification and sun/food/supplement guidance.
Choose measurements that describe your actual session or situation, confirm the units, then calculate. Read the result alongside its assumptions and use the tool again when your inputs change.
Inputs explained
25-OH Vitamin D (ng/mL)
Enter a measured or estimated value (minimum 5) (maximum 100), using the unit indicated in the field label.
Latitude
Choose the option that matches your context; available options include High (north), Mid, Low (equator).
Sunlight exposure (hr/day)
Enter a measured or estimated value (minimum 0) (maximum 8), using the unit indicated in the field label.
Current supplement (IU/day)
Enter a measured or estimated value (minimum 0) (maximum 10000), using the unit indicated in the field label.
Skin tone
Choose the option that matches your context; available options include Light, Medium, Dark.
Age
Enter a measured or estimated value (minimum 14) (maximum 100), using the unit indicated in the field label.
How to interpret the output
Screening outputs are informational, not a diagnosis. Discuss concerning symptoms or measurements with an appropriate clinician.
Repeat measurements using similar conditions when monitoring trends. Numerical predictions can vary with input accuracy, measurement method and individual circumstances.
Limitations and responsible use
Vitamin D supplementation should be guided by lab results and a physician. Excessive intake causes toxicity.
Read the full disclaimerFrequently asked questions
What does the Vitamin D Status Guide estimate?
Interpret vitamin D (25-OH-D) levels with deficiency/insufficiency classification and sun/food/supplement guidance.
Which information do I need for this health tool?
Provide 25-OH Vitamin D (ng/mL), Latitude, Sunlight exposure (hr/day), Current supplement (IU/day), Skin tone, and any additional fields shown above. Use your own relevant measurements and the units indicated in each field.
How should I interpret the result?
Screening outputs are informational, not a diagnosis. Discuss concerning symptoms or measurements with an appropriate clinician. Compare results with your goals and other relevant observations rather than using a single output to make a major decision.
Disclaimer: Vitamin D supplementation should be guided by lab results and a physician. Excessive intake causes toxicity. Read the medical disclaimer.
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