If the first digit on the bar code is 0, then the product is made in USA or Canada. Any other number is foreign made.
Paul
That's incorrect. The first digit of a the product's barcode has nothing to do with the country of origin.
The only possible way to tell is to look for a country of origin declaration on the package or on the product itself, but as those declarations are sometimes falsified, you can't be certain in any case.