how to give a b12 injection in the arm self-inject intramuscular vitamin - Overview Safe B12 Injection Guide at

People with Digestive or Autoimmune Conditions Conditions such as Crohns disease, celiac disease, ulcerative colitis, and other gastrointestinal disorders can significantly impair the bodys ability to absorb nutrients, including B12

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In people whose vitamin B 12 deficiency is related to overgrowth of intestinal bacteria, treatment with oral antibiotics such as tetracycline (sold under several brand names) may stop bacterial overgrowth and allow the absorption of vitamin B 12 to return to normal

PMID 23870976

The recommended dietary allowance for adults is 2.4 micrograms per day according to the NIH Office of Dietary Supplements (updated 2025)

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