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For those truly low on B12, getting injectable B12 for humans can be transformative
The one primary-source injectable number comes from a 1990s ProCyte hair-growth patent, which describes intradermal formulations of the AHK-Cu class at 100500 micrograms per 0.1 mL in saline or sterile water [4] but that is an animal / formulation specification, not a human dose
It can interact with metformin (Glucophage), most commonly taken for diabetes, or proton pump inhibitors that are taken for gastric issues
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