The ingredient on a pack is a good first indicator of a product. We do a general check of the ingredients list and check for any Vegetarian or Halal logos. This includes checking e numbers, carmine, gelatine, etc. But also why a product is suitable for vegetarian, for example, Muslims can eat Rennet whereas Vegetarians do not.
We then contact the brand manufacturer, either by email or phone. We ask about cross-contamination, whether any ingredients are animal-derived and if any contain alcohol.
On occasion if we need to speak to scholars, we will do so.
We draft our posts and do a final review before publishing.