Ultra-pasteurized milk lasts three times longer than HTST processed milk because the higher temperature not only kills the usual suspects like E. Coli and salmonella, but UHT kills all other non-pathogenic bacteria that can cause spoilage, too. ... Pasteurization is just one step in our long food safety checklist.

Why is ultra-pasteurized milk bad?

The sad part is when milk is treated at such a high temperatures, it doesn't only kill harmful pathogenic bacteria, that the milk may have, it also kills the healthy bacteria in milk. Not just bacteria, ultra-pasteurization degenerates sugar, protein, enzymes, and vitamins in the milk.

What is the difference between pasteurized and ultra-pasteurized milk?

The main difference between Ultra-Pasteurized and normally pasteurized milk is the temperature it's heated to. It's heated to 280°F at the minimum, which means that it's able to kill almost all of the bacteria that the normal pasteurization process may have missed (Keyword here being almost—it's not sterile.).