FDA warns Purell its products can't treat or prevent ...- reflection paper is the hand sanitizer effective ,Story at a glance. The hand sanitizer giant Purell was accused by the FDA of making unfounded claims that its products prevent and help stop virus spread.FDA warns Purell its products can't treat or prevent ...Story at a glance. The hand sanitizer giant Purell was accused by the FDA of making unfounded claims that its products prevent and help stop virus spread.