But that's the issue vegans can't live without artificially supplementing with B12. To me that shows the vegan diet is not valid or survivable. If you were on a

But that's the issue vegans can't live without artificially supplementing with B12. To me that shows the vegan diet is not valid or survivable. If you were on a desert island or stuck in a remote location and were vegan you'd be dead after a few years from B12 deficiency.