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Adding 2ml to a 5mg vial works but you'll inject the full vial for loading doses
If you think a B12 deficiency may be behind how you have been feeling, the safe first step is to get tested
For a detailed breakdown of route-specific mechanisms, absorption differences, and use-case matching, see GHK-Cu Topical vs Injectable: Route Comparison
Electrolyte replacement becomes important if diarrhea is significant
They are not intended for human consumption or for any therapeutic, diagnostic, or clinical use
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