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AI and UL are defined by EFSA the same as in the United States
NNMT is an enzyme that methylates nicotinamide (vitamin B3) using S-adenosylmethionine (SAM) as a methyl donor
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
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