Because B12 plays an important role in the bodys absorption of iron, insufficient levels of this vitamin can lead to anemia
A seminal cost analysis published in Canadian Family Physician (2001) projected that switching patients from intramuscular B12 injections to oral supplements could save between $2.9 million and $17.6 million depending on the population studied with one Ontario analysis estimating $14.5 million in savings for 110,000 elderly patients
B12 injections can aid in the prevention of certain diseases
2017 Feb Omar Ahmed Abdelwahab, Ahmed Abdelaziz, Sherein Diab, Ali khazragy, Toka Elboraay, Taha Fayad, Rehab Adel Diab, Ahmed Negida
That means it takes them longer to get to work, and theres less B12 absorbency