25-Hydroxy Vitamin D3: normal range and what it means
Short answer: The healthy 25-Hydroxy Vitamin D3 range HealthOS uses is 30 – 60 ng/mL for adults. In SI units that is about 75 – 150 nmol/L. Many labs print a wider reference range, so read your value against the one on your report too.
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Where does your 25-Hydroxy Vitamin D3 sit?
Same number as µg/L.
Your result
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Information, not a diagnosis. Talk to a doctor about your result, and sooner if you feel unwell.
Vitamin D status — important for bone, immune and metabolic health.
Normal range
Adult reference range.
- Deficient< 20 ng/mL
- Insufficient20 – 30 ng/mL
- Optimal30 – 60 ng/mL
- High60 – 100 ng/mL
- Excess≥ 100 ng/mL
What it measures
The storage form of vitamin D and the best measure of your status. It supports bones, immunity, mood and muscle.
What moves it
Sun exposure, skin tone, latitude, supplementation and body fat.
How to bring it into range
Sensible sun exposure and supplementation (often 1,000–2,000 IU/day) with vitamin K2 and magnesium.
How fast it responds
Weeks to months.
Also reported as: vitamin d · 25-oh vitamin d · vit d · 25-hydroxyvitamin d
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Common questions
- What is the normal 25-Hydroxy Vitamin D3 range?
- The healthy 25-Hydroxy Vitamin D3 range HealthOS uses is 30 – 60 ng/mL for adults. In SI units that is about 75 – 150 nmol/L. Many labs print a wider reference range, so read your value against the one on your report too.
- What does a high 25-Hydroxy Vitamin D3 mean?
- A value above the reference band means 25-Hydroxy Vitamin D3 is outside the range typical for a healthy adult. A single reading is rarely conclusive on its own — what matters is the trend across draws and the other markers around it, which is why HealthOS reads the whole panel together rather than one number at a time.
- How do I improve my 25-Hydroxy Vitamin D3?
- Sensible sun exposure and supplementation (often 1,000–2,000 IU/day) with vitamin K2 and magnesium.
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Reference ranges are general-population guidance compiled from common clinical laboratories, not a diagnosis. Lab-to-lab ranges differ. Always read your results with your doctor.