Connect+ nutrition logging barcode scanning

Hi all.

I started using the nutrition logging element of C+ a few weeks ago, and have found it quite helpful, albeit not perfect. One thing I have wondered is how the barcode scanning element works given that virtually anything you can buy from a supermarket scans (I'm in the UK), but so far no sports nutrition product (Styrkr/ Science in Sport etc) that I've ever tried does. Do the supermarkets themselves input the barcode info, or is there a more widely accessible database that those companies contribute to and that Garmin can access. It seems odd to me that sports specific products are completely missing from this feature on what is a sports based app, whilst virtually any UPF from the major supermarkets pops up straight away..

Steve