The Mad Millie Sourdough Starter Culture requires no cultivating. You can add this straight to your dough mix without any hassle of growing or maintaining your sourdough starter. This culture contains: Yeast, Dextrose, Lactococcus lactis subsp. Cremoris, Lactococcus lactis subsp. lactis, Lactococcus lactis subsp. lactis biovar diacetylactis. Each sachet can be used to ferment dough recipes that use up to 6 cups of flour. Contains: milk/dairy This culture is shelf-stable for 8 months.