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Riboflavinisanaturallyoccurringcompoundandanessentialhumannutrient.Studiesinthe 196 0sand 70sshowedthatitcouldbeeffective ,whenexposedtovisibleorUVlight,ininactivatingvirusesandbacteria1.Otherstudiesshowedthattheprincipalmodeofactionisthroughelectrontrans