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Lastly, B12 is vital for red blood cell production and DNA synthesis
Branched-chain amino acids
Langmuir
Cells in the lining of the stomach produce intrinsic factors, and if these cells are damaged or if the stomach is otherwise unable to produce it, vitamin B12 absorption can be impaired
"Product Information sheet m-ENDO AGAR (7724)" (PDF)
Even with total serum B12 concentrations considered to be within the normal range, neurological or in some cases hematological symptoms related to B12 deficiency have been reported
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