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B12 injection shots can usually be felt within 24 hours (and a change should show in blood tests after a month or two) A high dose of B12 oral supplementation takes the same time as an injection: roughly 24 hours to feel an improvement and then up to 2 months to show in blood markers
active ulcer, serious liver disease, hypotension, or gout)
What Side Effects Have Been Reported
Its either a compounder operating in a legal gray zone or an outright black-market supplier
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