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Multivitamin/mineral supplements marketed in the US commonly contain 400 g of folic acid, and many prenatal supplements marketed in the US contain 800 g of folic acid
Pregnancy roughly doubles iron requirements (to ~27 mg/day in the second and third trimesters), which is why even a borderline first-trimester ferritin of 30 ng/mL is now considered insufficient by the British Society for Haematology and the WHO
[6] Target ferritin levels in your blood should be between 30 and 40 ng/mL
In cases of unexplained macrocytic anemia associated with high homocysteine levels and normal B 12 testing results, folate testing may be arranged if supported by laboratory specialist consultation
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