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The RDA for Vitamin B12 for adults is set to 2.4 mcg (2.6 mcg in pregnancy and 2.8 mcg while breastfeeding) and represents the amount needed to prevent a damaging Vitamin B12 deficiency
In summary, use the injections for as long as they are providing a clear benefit and need
The NIH Vitamin B12 Fact Sheet for Health Professionals notes that oral supplementation is appropriate for many patients who do not have intrinsic factor deficiency
Fortunately, many are mild and improve as the body adjusts
NNMT is an enzyme that methylates nicotinamide (vitamin B3) using S-adenosylmethionine (SAM) as a methyl donor
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