What Is a Normal Vitamin D Level?
The normal Vitamin D range is 30–100 ng/mL (optimal 40-60). Values below or above this range may indicate a condition that requires further evaluation.
Reference Range Table
| Marker | Low | Normal | High |
|---|---|---|---|
| Vitamin D (25-OH) | Below 20 ng/mL — deficient | 30–100 ng/mL (optimal 40-60) | Above 100 ng/mL — toxicity risk |
What Affects Your Results
Season and sunlight exposure (levels drop in winter), skin pigmentation (darker skin produces less vitamin D), age, body weight (vitamin D is fat-soluble and stored in fat tissue), sunscreen use, and supplementation.
When to Retest
If deficient and supplementing, retest in 8-12 weeks to confirm levels are improving. Once optimal, test annually, ideally at the end of winter when levels are lowest.
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