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.
Comparison 1: Preconception lifestyle advice on a combination of any of the following topics: weight, diet, vitamin and mineral intake, alcohol intake, caffeine intake, physical activity, smoking, and/or other substance abuse vs routine care or attention control, Outcome 4: Reported behavioural changes in vitamin and mineral supplement intake: use of folic acid supplement
