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You don’t need to supplement b12 if you eat meat unless you have health issues that cause malabsorption.
Not really, many many more people are B12 insufficient than there are vegans/vegetarians. And much of what B12 you get is because supplements are given…to the animals. See e.g. https://baltimorepostexaminer.com/carnivores-need-vitamin-b12-supplements/2013/10/30