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When I compare images of the package label UPC barcodes with these codes the zero isn't there. Having written an application that stores and uses pharmacy item UPC barcodes, I can assure you the scanned barcodes do not have this extra "0".

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It’s likely the leading zero is to make a UPC-A (12 digits) compliant with EAN-13

https://en.m.wikipedia.org/wiki/International_Article_Number

The most commonly used EAN standard is the thirteen-digit EAN-13, a superset of the original 12-digit Universal Product Code (UPC-A)

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