@aehdeschaine Pretty much all the nasal sprays are "generally accepted as safe" stuff, so not any riskier for kids than for you.

None of them are especially effective; the peer reviewed studies come out around 40% reduction sorts of numbers. (= you still have to wear a respirator all the time.)

That said, a combination of nasal sprays and viralcidal gargling is entirely worth doing when exposed; I think of it as trying to empty chambers of the metaphorical revolver.

@aehdeschaine The reasonably effective options AIUI are carrageenan (e.g. [Betadine](https://www.betadine.ca/cold-defence/)) and nitrous oxide ([Enovid](https://buyenov.com/)). You can also use prov-iodine gargle or throat sprays (another [Betadine](https://www.betadine.ca/sore-throat/)) or mouthwash with at least 0.07% CPC. (Some of the Crest Pro-Health variants.)

COVID is dose dependent and there is evidence that making nasal replication hard helps. I treat exposure as a reason to use all of the above.