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Recommended vitamin D optimal levels based on various sources.
| Author | Serum Total 25-Hydroxyvitamin D (ng/mL) | Subjects | Reference |
|---|---|---|---|
| Institute of Medicine | 20–50 ng/mL | Adults | [97] |
| Endocrine Society | 30–100 ng/mL | Adults | [98] |
| Hollis and Wagner | >40 ng/mL * | Pregnant women | [93] |
| Dawson-Hughes et al. | >40 ng/mL * | Elderly | [99] |
* Maximum level not reported.
