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If we admit that vegans need to get vitamin B12 through fortified foods or supplements, are we saying that a vegan diet is unnatural?

One point to consider is that feces contain large amounts of vitamin B12, produced by bacteria in the colon, and that if we found ourselves in a state of nature, and still wanted to be vegan, we could get enough B12 from feces, though it would be important to make efforts to make sure the bacteria were killed and viruses were neutralized. Admittedly, that's not terribly appetizing.

It's also possible that humans could get substantial amounts of vitamin B12 from insects and other bugs, if we didn't want to resort to killing vertebrate animals or eating their eggs or milk.

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