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The optimal dosing, administration route, and cycling protocol for humans remain uncertain

Once levels stabilize, injections are commonly spaced out to monthly or every few months

Increased intestinal permeability and tight junction alterations in nonalcoholic fatty liver disease (in Eng)

Vitamins contain essential micronutrients that are needed for normal cell function, growth, and development

Subcutaneous B12 administration, although promising in select cases such as congenital cobalamin disorders, lacks comprehensive comparative studies against IM and oral routes

So the practical takeaway is not oral is better or SC is better. It is: pick one route, follow the documented per-dose figure for the vial you have, and keep the route constant so that whatever you observe is not confounded by a mid-stream route change