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Because B12 shots are administered intramuscularly, they bypass the digestive system, allowing the body to absorb a much larger amount of B12 that would otherwise be lost during digestion
doi: 10.1007/s13238-020-00789-5 6 ZhuJBerisaMSchworerSQinWCrossJRThompsonCB
A preparation that has lost its copper still has the same amino-acid sequence and is nevertheless a different material, and no sequence-based check will notice the difference
Int J Mol Sci (2013) 14:326584
Lets look at the main factors to consider: Bioavailability Traditionally, injection has been considered the most efficient route of administering peptide drugs due to their instability and rapid degradation with oral, topical, and other delivery methods
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