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Very interesting, at the preprint site MedRxiv: Transcobalamin Receptor Autoantibodies in Central Vitamin B12 Deficiency. The list of authors looks impressive, thus I guess it will be published eventually. The authors say that the newly-discovered disease is similar in its mechanisms to the autoantibody-induced form of cerebral folate deficiency. Antibodies thwart the transport of the vitamin to the central nervous system, and the blood levels of the vitamin remain misleadingly normal. Cheers, -- CopperKettle ( talk) 10:16, 26 August 2023 (UTC) reply

It has been published: Transcobalamin receptor antibodies in autoimmune vitamin B12 central deficiency - Pluvinage et al., 26 Jun 2024 -- Maybe it will be worthwile to mention it, or even to start a standalone article -- Cheers, -- CopperKettle ( talk) 05:40, 28 June 2024 (UTC) reply

It's well established that M. Tuberculosis is dependent on vitamin B12 [1] and deficiency of B12 in organism is common in TB patients. [2] [3]. Some limited studies suggest it as a biomarker of TB treatment. I sugget to mention this fact. AXONOV (talk) ⚑ 16:46, 13 March 2024 (UTC) reply