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.
Distribution of measured serum 25(OH)D (ng/ml) among 1662 young African American women from Detroit, Michigan, stratified by vitamin supplement use (top and bottom panels) and use of estrogen-containing contraception at the time of blood sample. Supplement and no estrogen, N = 561; supplement and estrogen, N = 110; no supplement and no estrogen, N = 875; no supplement and estrogen, N = 116.
