GS1 is a new schema markup for products. Google’s John Mueller said on Twitter that Google does not use GS1 markup at all. Google does not use it for search, ranking, rich cards, or any other purpose.
I'm not aware of us using that at the moment. In general, we'd document it if we supported it directly; putting more structure into your content can be useful regardless though. Maybe @danbri has something more though.— John ☆.o(≧▽≦)o.☆ (@JohnMu) 5. März 2018
How to scan your website for structured data markup
Among many other things, the website audit tool in SEOprofiler checks your website for structured data. You can create your SEOprofiler account here: