UHT is most commonly used in milk production, but the process is also used for fruit juices, cream, soy milk, yogurt, wine, soups, honey, and stews. UHT processing is now widely used for producing 'long life' products such as cream, custard and flavoured milks. What is long-life milk? The name "long-life milk" is used to describe milk that's been treated in special ways to help it last longer outside a refrigerator or cooled. Previously, Swaisgood and coworkers used immobilized sulfhydryl oxidase to reduce the thiol content of UHT-heated skim milk and described.