Naturally fermented. Unpasteurized. USDA organic. www.glkfoods.com. Certified organic by Quality Assurance International. Cortland Valley Organic Sauerkraut is not pasteurized, which means the beneficial microflora and enzymes are not destroyed. These microflora may cause some additional fermentation to occur which can result in the bag swelling. This is a natural process and does not affect the quality of the sauerkraut.