The better option depends on symptoms, goals, comfort level, and provider guidance
Prevalence of vitamin B 12 deficiency among the elderly In general, vitamin B 12 level declines with age and therefore prevalence of vitamin B 12 deficiency increases with age.1 Studies have shown that prevalence of vitamin B 12 deficiency among elderly can range between 5% and 40% depending on the definition of vitamin B 12 deficiency used.1 2 3 4 5 6 7 Many studies have used serum vitamin B 12 level with or without additional tests for its metabolites like homocysteine and methylmalonic acid (MMA) to estimate the prevalence of vitamin B 12 in the population
This means that only a fraction of the substances become available for the body to actually use
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If given IV, it must be injected slowly (often over at least 5 minutes or diluted in a larger volume bag and infused)
