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The injection site When people complain about arm or leg pain after B12 injections, its often because of intramuscular delivery
Faster metabolism
Obesity classification
B12 (typically cyanocobalamin or methylcobalamin) is placed directly into the muscle, so it is reliably absorbed into the bloodstream and carried to the cells that need it
The dosing regimen varies depending on whether neurological symptoms are present: With neurological involvement: 1 mg intramuscularly on alternate days until no further improvement, then 1 mg every 2 months [3] [4] Without neurological involvement: 1 mg intramuscularly three times a week for 2 weeks, then 1 mg every 2-3 months for maintenance [3] [4] There is some evidence that high-dose oral B12 (1000-2000 micrograms daily) may be effective even in some malabsorption conditions, though UK practice still generally favours intramuscular treatment in these cases
People with Digestive Issues : Individuals with digestive conditions such as Crohns disease, celiac disease, or irritable bowel syndrome (IBS) may have difficulty absorbing B12 from food
