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2. Vitamin B12 - Wikipedia

   en.wikipedia.org/wiki/Vitamin_B12

   The US National Academy of Medicine updated estimated average requirements (EARs) and recommended dietary allowances (RDAs) for vitamin B 12 in 1998. [6] 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 ...

3. How vitamin B12 could give you an energy boost - AOL

   www.aol.com/finance/vitamin-b12-could-energy...

   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 ...

4. Human nutrition - Wikipedia

   en.wikipedia.org/wiki/Human_nutrition

   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.

5. These High-Quality Vitamin B12 Supplements Can Help ... - AOL

   www.aol.com/lifestyle/high-quality-vitamin-b12...

   Again, the daily recommended dietary allowance of vitamin B12 for most adults is 2.4 micrograms, stretching up to 2.6 and 2.8 micrograms if you’re pregnant or nursing.

6. Vitamin B12 deficiency - Wikipedia

   en.wikipedia.org/wiki/Vitamin_B12_deficiency

   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. [161] In Germany, a national survey in 1998 was conducted in 1,266 women of childbearing age.

7. The Supplements Doctors Actually Think You Should Take - AOL

   www.aol.com/supplements-doctors-actually-think...

   From vitamin B12 to calcium. Credit - Tanja Ivanova—Moment/Getty Images. D ietary supplements are a booming business. More than half of U.S. adults take at least one, and the supplement industry ...