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In page Lactose intolerance:

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Lactose is found primarily in dairy products, which vary in the amount of lactose they contain:

  • Yogurt – lactobacilli used in the production of yogurt metabolize lactose to varying degrees, depending on the type of yogurt.[13] Some bacteria found in yogurt also produce their own lactase, which facilitates digestion in the intestines of lactose intolerant individuals.[5]
  • Cheese – fermentation also reduces the lactose content of cheeses and aging reduces it further; traditionally made hard cheeses might contain just 10% of the lactose found in an equivalent volume of milk.[14] However, manufactured cheeses may be produced using processes that do not have the same lactose-reducing properties.[citation needed]