If you want to go into details. Glatin is made from animal bones. In pakistan little kids collect bones out of trash and waste dumps and sell them to people who buy those bones and resell it again to bones procecssing plants. Now think of it. In Pakistan the donkeys , the dogs , the horses whatever animal dies goes to waste dumps and you cannot tell if this bone came from a donekey or a cow or a dog.
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How do I know about those bones picking boys from Pakistan and what is done with those bones.
Because I remember watching a TV program on Pakistan TV when I was a kid. This program was presented by Laiq Ahmed about what happens to bones picked by those kids.