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Laboratory factors such as macro-B12 (immunoglobulin-bound B12) can cause spurious elevation on some assays
Personal Preference for Maintenance: Once acute deficiency symptoms are managed, some patients may prefer to switch to oral supplements for ongoing maintenance, again, strictly under medical supervision to ensure their levels remain stable
This is not a single-target drug
Gray-market vials sold online carry none of those protections, which matters even more for peptides whose evidence is still developing
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