yellow urine after b12 injection Quantification of chromatographic effects of vitamin B supplementation in and implications for hydration assessment Ever wondered why your pee

If you have pernicious anaemia the treatment is needed for life

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

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It is often prescribed for individuals with pernicious anemia or other conditions that impair B absorption (for example, after gastric surgery or in certain digestive disorders)

Approved Medical Uses: Prevention & Treatment of B12 Deficiency: Corrects low B12 due to poor nutrition, GI disorders, or malabsorption

A 5mg vial can be the better fit when a laboratory wants a smaller, clearly defined format for controlled pathway analysis and organized internal comparison