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vitamin b12 injection dose medscape Shots & Injections for Weight Loss B12 Injection Dosage and Frequency:
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5-Amino-1MQ does not require a prescription as its not FDA-approved for medical use and is sold as a research compound

Cell Biochem Biophys 67:865873

Why Liquid B12 Outperforms Tablets for Most Adults Standard B12 tablets need stomach acid and intrinsic factor to be absorbed in the small intestine

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It doesn't require anything more exotic than the basic fact that this population is routinely left out of the research that would answer the question
