(CNN) — It can be difficult to know how effective hand sanitizers are.
The Food and Drug Administration says not to believe everything companies say on their web sites.
The agency wrote a strongly worded letter to Gojo, which makes Purell, warning the company to stop making unproven claims.
The FDA takes specific issue with Gojo’s site claiming Purell may kill the Ebola virus.
No hand sanitizers have been tested against Ebola.
The letter also calls out the company for claiming Purell kills MRSA and other germs and that it can reduce student absenteeism by 51 percent.
The FDA doesn’t say these claims are definitely untrue.
The issue is the agency forbids hand sanitizers from claiming they can protect people from getting sick.
Only federally approved drugs are allowed to do that.
The FDA says if Purell wants to get approved as a drug, it can market whatever it can prove.
If not, it has to stop making those claims.
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