I found something that might make sense in the context of a charm - maybe this will be of interest
“palsen” is a spoken Bavarian/Austrian form of the written word ‘Palssam’ or “Palsam”:
Dictionary of Bavarian Dialects in Austria:
You are not allowed to view links.
Register or
Login to view.
Palsam, in turn, is a type of balm (something fragrant / fragrant plants)
You are not allowed to view links.
Register or
Login to view.
Just a little find, whatever you want to do with it
PS: However, I was unable to determine whether it was already used that way in the Middle Ages.