It is true that there is a link between cognitive decline and low amounts of Vitamin B12
[DOI] [PubMed] [Google Scholar] 69.Michaud JL, Boucher F, Melnyk A, et al
A 2020 study published in Environmental Research found that children and adolescents with higher vitamin B12 levels were less likely to be obese 5
When picking a B12 formulation, its key to think about the patients specific needs and any possible interactions with other drugs
I'm not sure if you'll be able to get lower shots but it might be worth asking
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