RFKjr. is hard to listen to because of his unfortunate spasmodic dysphonia, but he has some great information. So be patient.
Scott’s preliminary results suggest that many types of disease-causing bacteria have the potential to become or already are resistant to zinc- and copper-based antimicrobial substances. Bacteria exposed to oregano oil and menthol, however, currently do not appear to readily develop resistance to these antimicrobial alternatives.