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We cannot find the full text of one study which seems to be included

It is not intended for human or animal consumption, diagnostic use, therapeutic use, clinical use, food use, cosmetic use, or household use

Strict vegans and vegetarians may develop deficiency over time, as B12 is found almost exclusively in animal products

Since the paper in question will be retracted from print and online versions of a journal, and any associated databases, it would be logical to assume that the journals editor or editorial board would make the decision to retract, but that is not always the case

Compare BPC-157 by mechanism, evidence strength, expected timeline, side-effect profile, and whether its primary use case matches your goal