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Availability, regulatory status, and supply chain reliability all play into the practical calculus of choosing between them

[DOI] [PubMed] [Google Scholar] 15

Where possible, avoid suddenly reducing the B 12 dose or injection frequency, as too rapid dose reduction may worsen symptoms or lead to symptom recurrence.26 Instead, gradually increase the interval between B 12 injections over the course of several months while monitoring symptoms

Low B12 levels have been linked to thinning hair, brittle nails, hyperpigmentation, and skin inflammation
