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why does lactose free milk last longer

Apparently the process used by manufacturers (ultra-pasteurization) to produce lactose-free milk is responsible for the longer shelf life. Lactose-free milk is pasteurized at a higher temperature than regular milk. The process, known as ultra-pasteurization, is designed to remove the bacteria content entirely, giving lactose-free milk a refrigerated shelf-life of 60-90 days, compared with regular pasteurized milk, which retains some bacteria.

It has a shelf life of 1-3 weeks. A producer (in the United States) of organic dairy products (Organic Valley) describes ultra-pasteurization and the extended shelf-life Ultra Pasteurization (UP), or Ultra High Temperature (UHT) pasteurization, is the process of heating milk to approximately 280 бF for just 2 seconds and then chilling it back down rapidly. The result is milk that's 99. 9% free from bacteria. This pasteurization process creates an extended shelf-life for milk products of up to three times the length as HTST pasteurization; while providing the same wholesome, quality dairy product.

This allows us to distribute UP milk products regionally as well as to other areas of the country that might not have access to our dairy products. This is referred to as 'ultra pasteurized' on the milk package. Organic Valley offers its quarts and some of its half gallons of milk with Ultra Pasteurization (UP).
Drinking lactose-free milk can prevent the symptoms of lactose intolerance if you're one of the approximately 30 million Americans with lactose intolerance, according to MedlinePlus.

The most common symptoms include abdominal discomfort, including nausea, diarrhea, gas and bloating, which begin 30 minutes to two hours after ingesting lactose. The incidence of lactose intolerance increases as you get older; it occurs most commonly in people of African-American, Asian, Mediterranean or Native American descent.

Some people can tolerate a small amount of lactose in their diet, while others can't. Lactose intolerance doesn't cause serious illness or have long-term health effects. Avoiding lactose or taking over-the-counter lactase when you eat dairy products is the only treatment necessary.

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