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The EAR for vitamin B 12 for women and men ages 14 and up is 2.0 μg/day; the RDA is 2.4 μg/d. RDA is higher than EAR to identify amounts that will cover people with higher-than-average requirements. RDA for pregnancy equals 2.6 μg/day. RDA for lactation equals 2.8 μg/d. For infants up to 12 months, the adequate intake (AI) is 0.4–0.5 μg ...
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 ...
Orally administered vitamin B 12 is absorbed without intrinsic factor, but at levels of less than one percent than if intrinsic factor is present. [21] Despite the low amounts absorbed, oral vitamin B 12 therapy is effective at reducing symptoms of pernicious anemia.
The National Institutes of Health recommends that the average man consume a mere 2.4 micrograms a day, which is actually the lowest daily recommended dose of any vitamin. “Vitamin B12 ...
In women aged between 19 and 64 years, the mean serum vitamin B 12 concentration was slightly lower than men (298 pmol/L), with 3.3% having low vitamin B 12 concentrations < 150 pmol/L. [162] In Germany, a national survey in 1998 was conducted in 1,266 women of childbearing age.
2. Vitamin B12. One of eight B-complex vitamins, vitamin B12 is found naturally in some types of fish, red meat and fortified foods. It plays a key role in central nervous system function, DNA ...
The same cells in the stomach that produce gastric hydrochloric acid, the parietal cells, also produce a molecule called the intrinsic factor (IF), which binds the B 12 after its release from haptocorrin by digestion, and without which only 1% of vitamin B 12 is absorbed. Intrinsic factor (IF) is a glycoprotein, with a molecular weight of 45 kDa.
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 ...
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