Virtually every hand sanitizer comes with some sort of kill claim on the bottle, but according to the U.S. Food and Drug Administration (FDA), some of those claims are unproven.

The FDA is cracking down on companies making unproven claims on labels, such as: kills over 99.9 percent of MRSA; helps prevent skin infections caused by MRSA and other germs; or, is effective against a broad spectrum of pathogens, including MRSA.

Additional claims that have not been proven by the FDA are sanitizers that prevent infection from E. coli, the H1N1 flu virus or those that kill Salmonella. Letters have been sent to four companies that make or distribute hand sanitizers falsely making such claims on their labeling.

Users are advised to tread lightly when reading such claims on product labels. Concerned parties can go to for more information on these products.