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doi: 10.1046/j.1467-789x.2001.00040.x

A 2024 study published in the Proceedings of the Nutrition Society found deficiency prevalence ranges from 5 to 52% in vegans and 6 to 14% in vegetarians, depending on supplement use
Not all protocols include this tier

Morrow LA, OBrien MB, Moller DE, Flier JS, Moses AC

If you prefer, you can do part of the route on foot

It's a question that comes up a lot, and the short answer is that high B12 levels by themselves don't typically cause symptoms
