Table 2.

Vitamin D recommendations.

Recommendation	Children and Adolescents	Adults
The optimal concentration of 25(OH)D in plasma	20–60 ng/mL ≈ 50–150 nM	30–80 ng/mL ≈ 75–200 nM
Supplementations: recommended dose when severe deficiency	up to 5000 IU/day = 125 µg/d	up to 7000 IU/day ≈ 175 µg/d