Someone just told me about these. Originally developed for allergies, they coat your nasal passages and supposedly help protect against viruses. However, I can't seem to find any good information about them. Google results are all mumsnet and ads, so I am pretty dubious.
Does anyone have any reputable data on whether they make a difference? There's a new one called Taffix which is supposed to be Covid specific, but there's also Vicks and Boots Dual defence, which appear to be very similar and a lot cheaper.
I've barely been out of the house since lockdown started, but I have to go to a building site in London next week I want all the protection I can get.