Amazon Barcode Requirements
Unique items outside of the Amazon catalogue will require a barcode to be listed and sold on the site. This means that if your product can not already be brought from Amazon, it will need a barcode before you start selling it through Amazon.
This can deter some traders as not all unique products will have a barcode or a need for one. However, this shouldn’t stop you from shutting your products out of a potentially lucrative market; after all, you don’t want your competition to be grabbing all the sales.
In the UK, all barcodes, including those for use on Amazon, are supplied from GS1 UK. This is on a subscription basis and these codes will work for your products on Amazon.