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Not all B12 that you eat or take in supplements is absorbed and research indicates that to achieve a sufficient daily dose of B12, you should take at least five to 50 micrograms daily or 1,000 to 2,000 micrograms weekly (Del Bo et al., 2019
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
Sounds too good to be true, right
B12 injections are shots that contain high doses of vitamin B12 that are used to quickly elevate levels in someone with a deficiency
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