This makes sense given the mechanism
Why are B12 injection doses so much higher than oral supplements
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Regenerative Medicine , 13(4), 321336
They are delivered by the peptide administered at the right dose, through the right route, from a pharmaceutical-grade source, to a patient whose indication has been properly assessed, with activity guidelines in place that prevent the danger zone re-injury that the peptides anti-inflammatory effect makes possible
Intramuscular (IM) administration of B12 allows for direct delivery, bypassing the digestive system and ensuring efficient absorption, particularly in individuals with malabsorption or gastrointestinal issues