Fig. 2.
(A) Relative search volumes obtained using search word "vitamin” worldwide. (B) Mean of relative search volumes obtained using search words “vitamin,” “Immunity,” and “COVID-19” worldwide. RSV, relative search volume.
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.