Do you... eat the tar? Put it on your skin? What exactly do you do with it?
It's used small amounts in additive in soap or shampoo mostly as a scent, mouth pastille and lozenge a for taste, animal health care kind antibacterial and bug resistant etc. long time ago.
Quite lot of applications especially old times long time ago before more scientifically developed medicines were commonly available. These days less there but it's used as a scent or for flavour.
I'm also still unclear on how it was used to treat human illness (treating boats and roofs is clear enough)
https://en.wikipedia.org/wiki/Terva_Leijona
I'm guessing these might no longer contain actual tar.