People who are on certain dietary restrictions, especially vegans and those undergoing a weight loss regimen, may have a higher chance of developing vitamin B12 deficiency
They are administered via intramuscular injection, typically on a weekly basis
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When absorption is impaired due to a diagnosed condition such as pernicious anaemia, injections are generally the preferred and more effective option
Because intramuscular B12 is absorbed more slowly over a longer time frame than intravenous delivery, each shot offers a sustained elevation in serum levels between appointments
In this way, treatment plans can be tailored to the needs of an individual, depending upon factors such as the patient's age, health status, and the degree of the deficiency