is b12 injection intramuscular Vitamin Dosage for Adults: Guidelines The Truth About B12 Injections:

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This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation

This occurs when the body lacks sufficient B12 to produce enough red blood cells

Heavy pulling exercises such as biceps curls or pull-ups on a bar can put too much stress on the biceps tendon