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Note on scope
Vitamin B-12 is an essential nutrient with an enormous, well-established mainstream medical literature (deficiency diagnosis/treatment, pernicious anemia, neurological effects) — widely available over-the-counter, not a research-only compound. Given that breadth, this deserves its own dedicated citation pass rather than a folded-in summary here, same situation as L-Carnitine and DHEA elsewhere in this catalog.
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