Nobody I've met even knows what they are. I came across them years ago in the shaving section, and was blown away by their utility.
They are solid pieces of some saltlike material that are super effective at stopping bleeding. We don't even have bandaids in our house anymore, the pencils are way more useful.
For shaving cuts, typical knife cuts, paper cuts, etc, noticed nothing really.
(Spray antiperspirant might be, too, but spraying myself in the face has never sounded particularly appealing)
It’s not designed for this purpose, and you’re putting this substance on an open wound, so try at your own risk.
Cyanoacrylate (also known as "Super glue").
I've been using it to cover some small clean cuts. I think today there's even variants approved for such use.
Yeah, look up ‘Vetbond’ and ‘Dermabond’. They are not strictly superglue, but longer chain cyanoacrylates, which confer them some properties such as higher flexibility and bacterial growth inhibition.
That said, they are cheap enough for everyone to have their own if that's a concern for you.
Otherwise you risk spreading virus and bacteria between people - this is hygiene 101.
I'd read the Army used to pack wounds with basically a crushed version of the same thing.