The FDA ruled on Thursday that dozens of active ingredients can't be used in hand sanitizers, but the agency still wants answers about one that is used - ethyl alcohol.
Ethyl alcohol is the most common ingredient in hand cleaners.
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The FDA says it wants more studies to determine if it is safe and effective.
Hand sanitizers are used by millions every day.
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The FDA did ban tri-clo-san, which some say can be absorbed through the skin.