I don't eat meat so I'm not insulted I sometimes put a bit Natron in my fondue but that's another matter of taste.

I doubt that meat tenderizers are that common in the average supermarket. I've searched for the most common German words but haven't found something at Migros or Coop:

Fleischzartmacher
Zartmacher
Fleischweichmacher
Mürbsalz
Fleischmürbsalz