Source: Vance Sabbe (firstname.lastname@example.org), r.c.b., 9/1/95
The pilsner enzyme is an important additive because it will lower the final gravity of the beer giving you the light bodied beer like Fosters and Heineken. Some beer kits include pilsner enzyme along with the yeast (i.e. Brewmart's Danish Pilsner and Dry kits). Also, if your brewshop has 'Glenbrew Secret Yeast' this brand of yeast has pilsner enzyme mixed in with the yeast.
Fermentation will also take longer, about 3 to 4 weeks at 68F, because the enzymes will take awhile to convert and unfermentable sugar(body) to sugars the yeast can convert to alcohol.