vitamin b12 tablets vs injection Injections vs. Supplements – Known Nutrition UK Getting The Best Out Of

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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

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While there isnt solid evidence that human requirements for B12 exceed the RDA, meeting the EFSA will put any vegan on par with most omnivores and should ensure optimal B12 status for anyone without suspected abnormal B12 metabolism