For anyone who has Wegman's nearby, if you go to their site and look at their hard cheeses and on each one, click on "Ingredients", they do list the type of rennet/enzymes in the cheese. I found these on their site, which are made with animal rennet: Wegman's Medium Le Gruyere Swiss Cheese Quarter, Wegman's 18 month Medium Gouda, Beemster Premium Goat Gouda, Beemster Smoked Gouda.