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Citations Andrs E et al, "The pathophysiology of elevated vitamin B12 in clinical practice." QJM, June 2013

While deficiencies take time to develop, people with gastrointestinal disorders, low stomach acid (common with aging), or those following vegan or vegetarian diets may struggle to get enough B12

While this may sound like a hassle compared to taking a daily pill, the effects of a single injection can last much longer depending on individual needs
2020 Mar;95(3):581-586

Preethi, and Ms

Measuring vitamin B-12 bioavailability with [13C]-cyanocobalamin in humans
