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Re:Blueprint health protocol – Bryan Johnson (founder braint... by yladiz on Tuesday January 02, 2024 @10:46AM (#38842771)
This directly contradicts the Wikipedia article on the subject [1], and in general the page you link looks more like pseudoscience than not. Do you have a better source, maybe from a published paper or the NIH?

1: https://en.m.wikipedia.org/wiki/Vitamin_B12_deficiency

Re:Blueprint health protocol – Bryan Johnson (founder braint... by tpush on Tuesday January 02, 2024 @11:16AM (#38843251)
Presumably referring to this sentence from the Wikipedia page you linked to, quote: "Marginal deficiency is much more common and may occur in up to 40% of Western populations.".