According to Jake and Barbara Zook - Zook's Organic Cheese is made from milk from grazing cows, the most natural way to feed cows. The cows graze on a farm that is certified organic by the Pennsylvania Certified Organic organization. No fermented feeds, bST, herbicides or insecticides are used. Our cheese is made from certified organic pasteurized cultured whole milk, salt and rennet. There are no preservatives added, and no artificial ingredients.