Lyofast PB 1 is a freeze-dried culture, it consists of selected strains of Propionibacterium freudenreichii ssp. shermanii. Lyofast PB 1 may be applied to produce big-eyed hard cheese such as Emmentaler and Swiss cheese types. Lyofast PB 1 ferments lactose and lactate producing carbon dioxide, propionic acid, and acetic acid. Lyofast PB 1 might be used in combination with other Lyofast cultures.