>> standard gargle of mouthwash has been proven to kill the coronavirus, even if you get it, you may reduce viral replication. >> i'm telling people to take it seriously and do what you can to boost your immune system. eat healthy, a host of vitamins, an nih study that says mouthwash can help reduce viral replication in the first day. >> he cites an nih study. you're the top dog at the nih. what's the deal? >> well, it's not an nih study. it's a study done by some french researchers, and let's be clear. it's not a study that i think ought to make anybody run out and decide that gargling with mouthwash is going to help them if they're infected with covid-19. these researchers basically showed that mouthwash could reduce the viral load in your saliva, in your spit, to a moderate degree, but it wasn't terribly impressive. it was statistically significant, but i think clinically meaningless. keep in mind, you have virus not