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Further, NICE and the BNF says that if there are neurological symptoms present, then every other day injections are the recommended treatment, so all the points you make about B12 being stored and sufficient are not really relevant

It influences stress-related neurotransmitters like gamma-aminobutyric acid (GABA), promoting calmness and relaxation

If you just Google Chris Kresser B12, theyll pop right up at the top

The funder was involved in the following aspects: study design, data analysis and their interpretation, decision to submit for publication, general indications and overview in the writing of this article