Animal Source Digestive Protease is enzyme secreted by animals for a number of physiological processes, including the digestion of feed protein. Mold Fermentation appears as fuzzy spots that may be a variety of colors: blue, green, black, pink, or even red. The fermentation is invariably a mixed culture of moulds, yeasts and bacteria but the most important component appears to be Rhizopus oligosporus. http://www.china-naturebio.com/enzymes/animal-source-digestive-protease/