Epistemic status: I spent about 5 hours looking into this, and the next day developed covid myself. I did a bit more research plus all of the writing while sick. So in addition to my normal warning that I have no medical credentials, you should keep in mind that this knowledge may be cursed.

Nitric Oxide Nasal Spray, sold under the brand name Enovid, is a reactive compound that kills viruses (and I suspect taxes your nasal tissue). It has recently been tested and marketed for treatment of covid. The protocol I found in papers was 2 sprays per nostril every 2-3 hours, after you develop symptoms. Enovid's instructional pamphlets say twice per day, also after you get sick. This seems a little late to me.

I suspect the real power of NONS lies in use before you develop symptoms, ideally as close to [...]

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Outline:

(01:54) How does it work?

(02:52) How well does it work?

(04:57) Effect size on nasal viral load

(05:42) Effect on symptoms/transmission, as measured by poorly designed studies

(06:39) Other Diseases

(06:55) My wild ass guess of impact

(08:30) Can I get this effect for free, without the painful stinging or logistical hassle of a nasal spray?

(09:24) Should I just use this all the time?

(09:58) Where can I buy Enovid?

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Narrated by TYPE III AUDIO.