Table 1.

Rickets prevention by vitamin D supplementation.

Age	Dose IU
0–3 months	400/die
1–3 years	600/die
4–10 years *	600–1000/die
11–18 years *	1000–2000/die
19–65 years *	1000–2000/die
65–75 years	1000–2000/die
>75 years	2000–4000/die

* In persons who sunbathe with bare forearms and legs for 30–45 min between 10 a.m. and 3 p.m. without sunscreen from May until June, supplementation is not necessary, even though it is recommended and safe. In people who do not fulfill these criteria, supplementation is recommended throughout the year [8].