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Everyone requires a certain amount of B12 depending on their age, starting with .5 mcg per day for infants up to 2.4 mcg for teens and adults and even more—2.6 mcg and 2.8 mcg, respectively, for ...
How much vitamin B12 should you get in a day? Most adults should aim for at least 2.4 micrograms per day, according to the National Institutes of Health (NIH). However, it’s recommended that ...
Adults need about 2.4 micrograms of B12 a day (that much can be found in one portion of salmon, canned tuna or ground beef), with pregnant and nursing women needing slightly more (2.6 and 2.8 mcg ...
For women and men over age 18, the adequate intake (AI) is set at 4.0 μg/day. AI for pregnancy is 4.5 μg/day, and for lactation 5.0 μg/day. For children aged 1–14 years, the AIs increase with age from 1.5 to 3.5 μg/day.
The Recommended Dietary Allowance (RDA) for vitamin B12 is 0.9-2.4 μg/day, while the estimated average requirement in the U.S. and Canada is 0.7-2 μg/day. Elderly individuals with plasma vitamin B12 levels below 148 pmol/L are considered severely deficient, and those with levels between 148 and 221 pmol/L are marginally deficient.
Vitamin B 12 deficiency can be determined, but not always. [14] This means it measures forms of vitamin B 12 that are "active" and can be used by the body, as well as the "inactive" forms, which cannot. [151] Vitamin B 12 deficiency can be found within normal levels, so clinical symptoms should be taken into account when a diagnosis is made. [2]