Focusing on the pure meaning of Halal (certification); the thing of course is that at first it used to be dietary; ingredients and the way of slaughter.
Then it moved on to include the way and location of preparing food; the possible contamination if there was no separation with non Halal. And medication of course.
Then it became more and more everything that 'touches' the body, also external as skin crèmes, shampoo and toothpaste.
You can take this very very far. Who knows where the Hijab scarfs or Levis jeans are made and what religion the workers were and what they ate?