Some people have claimed on social media that gargling with iodine can prevent the spread and severity of a Covid infection, suggesting it as an alternative to getting the vaccine.
In Japan, daily gargling for hygienic reasons has been a common cultural practice for centuries, using everything from water, to tea, to antiseptics. During a press conference in August 2020, the state governor of Osaka prefecture, responding to a very small research study, suggested that gargling with povidone-iodine would help prevent Covid. When questioned about the strength of the scientific evidence, he side-stepped the question, replying: “It’s worth giving a try.
A recent review of the evidence attempted to answer the question: does povidone-iodine reduce the transmission of Covid? Much of this research turned out to be laboratory studies, with relatively few trials carried out on patients.
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