vitamins · 25(OH)D
Vitamin D (25-hydroxy)
Reflects vitamin D status, important for bone, immune, and muscle health. Deficiency is common, especially in winter and at higher latitudes.
This page is general wellness education, not medical advice. Your own lab’s reference range and your clinician’s interpretation always take precedence.
Typical reference range
| Group | General range |
|---|---|
| Adults | Sufficient ≥30; 20–29 insufficient; <20 deficient |
Optimal-band note: Many practitioners target 40–60 ng/mL; >100 can be harmful. Supplement to a measured deficiency, not blindly.
Units: ng/mL. Ranges vary by lab and assay — read yours against the range printed on your own report.
What high Vitamin D (25-hydroxy) can mean
- High-dose supplementation
- Excess sun (rare)
What low Vitamin D (25-hydroxy) can mean
- Low sun exposure
- Darker skin
- Obesity (sequestration)
- Malabsorption
- Older age