The Betadine gargle is sold out everywhere — on Amazon, on the manufacturer’s web site, at all of our local CVS and Walgreens stores. I eventually found it at one CVS in downtown Palo Alto and bought three bottles. I’ve been using it at the first sign of a sore throat for almost a year and none of my incipient sore throats have progressed to a full cold.
I also bought “Immunmist” which is a low concentration of povidone iodine nasal spray.
I haven’t had any pulmonary diseases since I got walking pneumonia three years ago (and that was as sick as I’ve ever been).
Find a 10 pct and cut it 10 to 1.