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Both are well-established forms of B12 that the body can use
That is deliberate: each presentation gets its own page, its own documentation trail and its own URL, so a citation or a purchase-order line that points at HCG at 5000 IU points at exactly one thing
Scientific & Chemical References PubChem NNMTi / 5-Amino-1-methylquinolinium iodide, CID 66522933: Public chemical record listing CAS 42464-96-0, formula C10H11IN2, and molecular weight 286.11 g/mol
It's also used to flush intravascular catheters
The results of the initial data collection were then presented to all the partners at a practice meeting