Here's The Exact Difference Between Pasteurized And Ultra-Pasteurized Milk - Tasting Table
Briefly

"Pasteurization is essential for ensuring the safety of milk and increasing its shelf life. This process not only eliminates harmful pathogens but also provides consumers with a safer product, highlighting the importance of informed choices when selecting milk."
"Ultra-pasteurized milk can sit on the shelf for up to three times longer than regular pasteurized milk, making it a popular choice among consumers who prioritize convenience without sacrificing taste."
Read at Tasting Table
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