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For patients without absorption disorders, high-dose oral B12 supplements (1,000-2,000 mcg daily) have been shown to be comparably effective to injections in correcting mild to moderate deficiency
Accessed August 6, 2025
Since this vitamin is essential for DNA synthesis, nerve cell health, red blood cell formation, and neurological function, a vitamin B12 injection really is a no-brainer
Adam Felman Author Adam is a freelance writer and editor based in Sussex, England
B12 shots lose their effect over one to two weeks
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