Related products and non-unique barcodes
These are several points to note and suggestions to handle them:
1) Nutrition facts and Barcodes aren't unique so there's a need to not make a barcode as an unique identificator of the product. Or, provide support for multiple products with same barcode.
2) Barcodes vary from one country to another. Even if it's the same product, barcodes may vary (Because the barcode format, etc). My suggestion is trying to add links to the same product even if they are in different countries.
3) Enhance search with filters. Many people wants to look for products that keep them healthier. So, the products should have info related to it and the capability to search inside them (sugar-free, zero cholesterol, gluten-free, etc)
4) Multilingual support for products. A product can be reffered differently if his name were written for an English Man or a Spanish man, duplicating product's info for the same product. The search won't recognize them.
Congratz for the initiative, But there's still a lot of work to do...
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cjk commented
I had a non-unique barcode only once so far. There's no guidance in such cases, which is very confusing for a new contributor.