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The peptide loses its biological activity, and you are injecting expensive, inert liquid
Both methods can effectively raise your vitamin B12 levels, but they work differently
Your clinician should tailor this to your situation and, importantly, to the underlying cause of deficiency (dietary vs non-dietary)
"Analytical approaches for the detection of emerging therapeutics and non-approved drugs in human doping controls." Journal of pharmaceutical and biomedical analysis 101 (2014): 66-83
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