its found for example at the back of a bar of choclate
UD is a type of Kosher status. I know from research that OU means "The circled U indicates that this product is certified as kosher by the Orthodox Union (OU). "
The D stands for dairy, and a U with a circle around it means that an item is Kosher, so UD means Kosher Dairy Source(s):
en.wikipedia.org and geocities.com/TruelyAmazingFac...UD means dairy ingredient is present in the chocolate.
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