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For vitamin B12, the U.S. Recommended Dietary Allowance (RDA) for pregnancy is 2.6 μg/day, for lactation 2.8 μg/day. Determination of these values was based on a RDA of 2.4 μg/day for non-pregnant women plus what will be transferred to the fetus during pregnancy and what will be delivered in breast milk.
Vitamin B12 absorption also decreases with age, so taking a B12 supplement of 2.4 mcg could be helpful after age 50, Poulson says. B12 deficiency can cause weakness, fatigue, anemia and peripheral ...
World Health Organization recommendation on Maternal Supplementation During Pregnancy states that "health benefits are expected for the mother and her developing fetus with little risk of detriment to either, from a daily supplement not exceeding 10,000 IU [preformed] vitamin A (3000 μg RE) at any time during pregnancy." [11] Preformed Vitamin ...
Vitamin A status involves eye health via two separate functions. Retinal is an essential factor in rod cells and cone cells in the retina responding to light exposure by sending nerve signals to the brain. An early sign of vitamin A deficiency is night blindness. [6] Vitamin A in the form of retinoic acid is essential to normal epithelial cell ...
When you buy a bottle of vitamins from a nutrition store, you’ll probably notice a best-by date on the bottom of the jar. But that inscribed number isn’t a hard-and-fast rule—there is some ...
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