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B12 is different than many other vitamin nutritional deficiencies in that it is only found in animal-based food products such as meat, dairy, and eggs which makes this a nutrient to be especially vigilant of for vegetarians and vegans

(6) The results suggest that conversion to oral supplements in the first year was considerably more expensive than intramuscular injections as a result of closer monitoring of those on oral supplements during the first year

There are two common approaches

Emmanuel Andrs, Thomas Vogel, Laure Federici, Jacques Zimmer, Ecaterina Ciobanu and Georges Kaltenbach

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One study in the The Journal of Allergy and Clinical Immunology found that some injected forms of B vitamins at higher doses, like B12, can be linked with an allergic reaction