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Lets be blunt

B12 injections help those who dont have enough of this vitamin

NAD levels decline with age, which has sparked a surge of interest in NAD IV drips, NAD injections, and oral precursors such as nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN)

Nackapan, If I understand correctly, you're saying that because a return of symptoms is experienced in a fairly short span of time without injections, this proves that someone with PA cannot utilize their stores of B12

[DOI] [PubMed] [Google Scholar] 43.Singh S.R., Sullo N., Matteis M., Spaziano G., McDonald J., Saunders R., Woodman L., Urbanek K., De Angelis A., De Palma R., et al