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Description
B12 may be listed on food labels as cyanocobalamin or methylcobalamin

Each compound has a unique receptor binding profile, but the injection fundamentals remain consistent across all of them
A vial at day 30 is not dramatically different from day 28, but a vial at day 60 has meaningfully less active peptide than one at day 14

This is another reason why dangerous, highly-localized injections should be avoided
