Actually, "ue" is the proper way to transcribe the ü-Umlaut in ASCII.
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That could be because Trader Joe-branded products don't use artificial preservatives. Natural milk has a shelf life of only a couple days. The stuff that is sold at most grocery stores is heavily treated.
BTW, TJ products are also GMO-free.
Having no German knowledge at all, I only know what I know from reading Wikipedia. ue is not used on the Aldi articles, ü is used exclusively. Don't know what that means.
Treated with what? Milk is homogenized and pasteurized, and maybe dome D3 added. Milk sold at grocery stores in the US is largely the same. Whether it's sold at Trader Joe's, Walmart, or any other large grocer, it probably comes from the same plant, and different labels used.