FD&C Red No. 4
Excipient (pharmacologically inactive substance)
What is it?
FDA has regulatory oversight for color additives used in foods, drugs, cosmetics, and medical devices. FD&C Red No. 4 may be safely used in externally applied drugs and cosmetics in amounts consistent with good manufacturing practice. All batches of FD&C Red No. 4 shall be certified in accordance with regulations as set forth by the FDA.
 Electronic Code of Federal Registers. Title 21: Food and Drugs. Part 74. Listing of color additives subject to certification. Subpart B. Drugs. Accessed online October 19, 2011. http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr;sid=c387334e82029536a53dde1171ba5481;rgn=div5;view=text;node=21%3A18.104.22.168.27;idno=21;cc=ecfr#21:22.214.171.124.126.96.36.199
 U.S. Food and Drug Administration. Color Additives: FDA's Regulatory Process and Historical Perspectives. Accessed 10/20/2011. http://www.fda.gov/ForIndustry/ColorAdditives/RegulatoryProcessHistoricalPerspectives/default.htm