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Description
Older adults The ability to absorb B12 from food tends to decline with age, partly because the stomach produces less acid over time, which is needed to separate B12 from the proteins it is bound to in food

[DOI] [PMC free article] [PubMed] [Google Scholar] 71.Krekels EH, van Ham S, Allegaert K, de Hoon J, Tibboel D, Danhof M, et al

If someone is significantly deficient in vitamin B12, theyll likely need to start with injections to boost their level up, and then can continue taking oral supplements to maintain that healthy level
DOSAGE AND ADMINISTRATION Horses: Give 5 - 10 mL by intramuscular injection regularly twice weekly, or as advised by a veterinary surgeon

Therefore, those who are vegetarian or vegan are more likely to be deficient in vitamin B12