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In simple terms: Capsules: easier, gut-focused, less direct systemic exposure Injections: more direct, stronger systemic exposure, more care required This does not mean one form is always better
The typical vitamin B-12 injection dosage that is administered is 1000 micrograms, or 1.0 CC
The ~1-2 mg/mL serum figures circulating in community sources are DIY formulation conventions, often borrowed from how GHK-Cu cosmetic serums are mixed, rather than results of any AHK-Cu human study
Make sure you consult the healthcare provider if the cost includes an initial consultation or additional health assessments
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