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An intramuscular (IM) injection delivers vitamin B12 directly into a muscle, usually in the upper arm, thigh, or upper buttocks
Subcutaneous injection addresses systemic inflammation: joints, skin, and autoimmune conditions
But hitting a larger vessel can produce a hematoma, a raised, tender collection of blood under the skin that takes longer to heal
It fails in the sense that the agitation can denature the peptide
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