Zhang L, Cai K, Wang Y et al
Vitamin B12 is essential for energy, brain function, and overall health, yet many people struggle with deficiencies that can leave them feeling fatigued and sluggish
Source Data Fig
Nat Rev Immunol 16(9):566580
Absent intrinsic factor is often associated with a condition called atrophic gastritis, a thinning of the lining of the stomach
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