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The effect seemed immediate
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
I suspect I'm not doing something right and not managing
These injections should only be used under medical supervision
Retrieved May 1, 2025, from Drugs.com database
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