Figure 1. Relation between age in years and serum 25-hydroxyvitamin D (nmol/L) concentrations stratified by gender.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.