"Tar, acclaimed to have been formed from the sweat of Väinämöinen, a central character from the Finnish national epic Kalevala, was an important medicament to the former-day Finns. Tar actually did bear antiseptic features, which worked as a cure for infections. Lately tar has been recognised to include parts that can cause cancer, and the European Union has urged that its use should be avoided." [1]

I personally dont know how tar was used for health, but it was big export item of Finland during medieval times.

[1]https://www.helsinkitimes.fi/themes/themes/health-a-wellbein...

Tar. Specifically wood tar,

Pine sap. You can get a schnapps of it, obviously.

Not the tapes, tar pit tar, the black thingy used in boats. And now that I read what's the translation it seems to be asphalt actually.