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Only about 1% of oral B12 is absorbed passively when intrinsic factor is absent or impaired
B12 deficiency often goes hand in hand with a folate deficiency, says Kozlowski
Studies suggest that the specific tripeptide sequence that forms AHK-Cu may confer distinct molecular properties, impacting processes such as extracellular matrix synthesis, fibroblast activity, and collagen deposition
Vegetarians who eat dairy and eggs have some B12 intake, but may still fall short of adequate levels
Mayo Clinic
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