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This could mean that two children with the same 25(OH)D concentration might have different neurodevelopmental outcomes if one has a VDR/DBP variant that impairs vitamin D signaling
Short answer: If you can absorb B12, high-dose oral B12 (1,0002,000 mcg/day) is as effective as intramuscular injections for normalizing levels in most people (AAFP
In addition, folic acid deficiency can cause falsely low serum vitamin B 12 levels
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