It's an approved food additive, like anything, it has issues, there isn't a food or additive that I know of that doesn't have some issues.
It is, however, recognized as safe by the FDA:
http://www.gpo.gov/fdsys/pkg/CFR-2009-title21-vol6/xml/CFR-2009-title21-vol6-sec582-1666.xml
What was...