New York (CNN Business) The US Food and Drug Administration is giving the maker of Purell products a stern warning: Stop making unproven claims that over-the-counter hand sanitizers help eliminate Ebola, MRSA or the flu.

In a "warning letter" to Purell's parent, Gojo Industries, the agency called out the company for making numerous marketing claims that potentially position its sanitizing products as a pharmaceutical drug rather than an over-the-counter topical antiseptic.

The letter from the agency's director of compliance cited several examples of what the FDA says are unproven claims for Purell products made on gojo.com, purell.com, and social media accounts for the brand.

The products at issue include Purell advanced hand sanitizer gentle & free foam, Purell advanced hand sanitizer gel and Purell advanced hand sanitizer gentle & free foam ES6 starter kit. These products, the FDA noted, are commonly sold for use in places like athletic facilities, schools, and offices.

Among the claims: Purell "Kills more than 99.99% of most common germs that may cause illness in a healthcare setting, including MRSA & VRE"; and "Purell Advanced Gel, Foam, and Ultra-Nourishing Foam Hand Sanitizer products demonstrated effectiveness against a drug resistant clinical strain of Candida auris in lab testing."

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