Hershey's Shelf Stable Milk is a Grade A milk procured from local family-owned dairies. Hershey's Milk is aseptically processed under Ultra High Temperatures (UHT). The UHT process enables our milk to remain fresh with or without refrigeration for 13 months from production date. Hershey Aseptic Products are certified 'rbST Free' (no artificial growth hormones are used)