intramuscular b12 injection needle size How to self-inject vitamin - Overview syringe and needle size for

The deltoid may work well for a person with developed muscles in the upper body

Women with autoimmune conditions affecting the stomach (such as pernicious anaemia or atrophic gastritis), inflammatory bowel disease , or those taking long-term metformin (MHRA advises monitoring B12 levels in at-risk patients) or proton pump inhibitors also have increased risk

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Your doctor may arrange further investigations including liver function tests, full blood count, and renal function to exclude underlying pathology

Neurologic complications are not always associated with megaloblastic anemia and are the only clinical symptom of vitamin B 12 deficiency in about 25% of cases (21)