The Common Chip Flavor That's Strangely Not Vegan-Friendly - Tasting Table
Briefly

Many vegan consumers are unaware that some flavors of potato chips, particularly salt and vinegar varieties, contain animal-derived ingredients like lactose. Lactose is often used to mellow the vinegar's acidity and enhance the flavor profile by providing a creamier texture. Popular brands such as Dirty Chips, Herr's, and Lay's Kettle Cooked include lactose, making them non-vegan. Therefore, it is crucial for vegans to read ingredient labels carefully to avoid unintentional consumption of non-vegan products like these chips. Fortunately, vegan-friendly alternatives are available for those looking for a snack.
Many salt and vinegar chips contain lactose, which is derived from milk. This ingredient adds creaminess and balances the sourness, making the chips more palatable.
Some popular brands that use lactose in their salt and vinegar flavored chips include Dirty Chips, Herr's, and Lay's Kettle Cooked—products that vegans should avoid.
Read at Tasting Table
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