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The following doses have been studied in scientific research: ADULTS: BY MOUTH: The typical general supplemental dose of vitaminB12is1-25 mcgper day: The recommended dietary allowances (RDAs) of vitaminB12are: 1.8 mcg; older children and adults, 2.4 mcg; pregnant women, 2.6 mcg; and breast-feeding women, 2.8 mcg
Serum B12 levels typically rise within 2448 hours following intramuscular injections and within one to two weeks with oral supplementation
It is not approved by the FDA for human use
Published human studies (Dhillo et al., JCEM, 2005) used IV bolus doses and observed rapid hormonal responses
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