This is a freeze dried mixed blend culture containing Penicillin Camembert AND Aromatic Mesophilic. So you no longer need to purchase Aromatic Mesophilic and Penicillin Camembert separately. Penicillin Camembert (ZX27) (also known as Penicillin candidum or Penicillin caseiolum) is essential in the ripening process of white surface mold cheeses such as Camembert and Brie and Aromatic Mesophilic (YV32) is essential in creating the creaminess and buttery flavour in the cheese. Strains included in this culture are: Penicillin candidum Lactobacillus lactis subsp. cremoris Lactococcus lactis subsp. lactis Lactococcus lactis subsp. lactis biovar diacetylactis Leuconostoc Each sachet doses 4L of milk. Shelf life is 12 months when stored in the freezer. These mold spores last out of the freezer (at room temperature) for 2 months so will be fine during postage. However, we suggest storing them in the freezer as soon as you get them in order to prolong their life.