Author: MAI Medical Information Team ·
Reviewed: 2026-04-14 ·
Sources: WHO, UpToDate, PubMed
Vitamin D Levels: Normal Range, Deficiency Symptoms & How to Supplement
Vitamin D is essential for bone health, immunity, and mood — yet an estimated 1 billion people worldwide are deficient. Here's everything you need to know about your vitamin D levels.
Vitamin D Normal Range
| Level | Concentration (ng/mL) | Assessment |
|---|---|---|
| Severe deficiency | <10 | Treatment required |
| Deficiency | 10–20 | Supplementation needed |
| Insufficient | 20–30 | Consider supplementation |
| Normal | 30–50 | Optimal level |
| High | 50–100 | Acceptable, monitor |
| Toxic | >100 | Risk of toxicity |
Vitamin D Deficiency Symptoms
- Chronic fatigue and weakness
- Frequent colds and infections
- Bone and muscle pain
- Mood changes and depression
- Slow wound healing
- Hair loss
How Much Vitamin D Do You Need?
| Age Group | Recommended Daily Intake (IU) |
|---|---|
| Infants (0-12 months) | 400 IU |
| Children (1-18 years) | 600–1,000 IU |
| Adults (18-70 years) | 1,000–2,000 IU |
| Older adults (70+) | 2,000–4,000 IU |
| Pregnant women | 1,500–2,000 IU |
Best Ways to Get Vitamin D
- Sunlight — 15-20 minutes of sun exposure on face and arms daily
- Food sources — fatty fish (salmon, mackerel), egg yolks, fortified milk, mushrooms
- Supplements — Vitamin D3 (cholecalciferol) is better absorbed than D2
MAI Tip: Check your vitamin D levels at least twice a year (spring and fall). Upload your results to MAI for instant AI analysis!
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⚠️ Important: This article is for informational purposes only and does not constitute medical advice.
Always consult your doctor before making health decisions.
Sources: World Health Organization (WHO), UpToDate Clinical Reference, PubMed Medical Research Database.
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Sources: World Health Organization (WHO), UpToDate Clinical Reference, PubMed Medical Research Database.