Some time ago, I researched the matter of lactose in mozzarella cheese, and I did find many articles that talked about lactose intolerance among many ethnic groups, including Asians. It was part of my usual reverse engineering work where I studied the Sugars in mozzarella cheese as recited in Nutrition Facts. Much to my surprise, I discovered that the amount of lactose in mozzarella cheese is quite low, especially in relation to other dairy products. In fact, if you look at the Nutrition Facts for the shredded form of the Grande whole milk mozzarella cheese, as given at http://www.grandecheese.com/products/Pages/Product_Spec.aspx?ProductMasterID=15
, you will see that the Sugars, which includes lactose, is given as 0 for one ounce of that cheese. I am sure that that number goes up when you increase the amount of cheese, but if you look at the Nutrition Facts for a more or less generic whole milk mozzarella cheese as given at the NutritionData.Self.com website at http://nutritiondata.self.com/facts/dairy-and-egg-products/25/2
, you will see that one cup of that cheese in shredded form has 1.2 grams of Sugars. And if you click on the More Details tab under Carbohydrates, you will see that the lactose included in that amount of cheese is 78.4 mg.
What I found from my research is that the lactose content of mozzarella cheese is fairly low because the lactose, or most of it, is removed when making the cheese. See, for example, the article at http://healthyeating.sfgate.com/mozzarella-lactose-6826.html.
As the article cautions, one shouldn't go overboard on dairy products with lactose but a reasonable amount of mozzarella cheese, and especially the drier forms, shouldn't pose a problem for most people who are lactose intolerant.