Discussion Pernicious anemia (PA) is a type of megaloblastic anemia caused by cobalamin (Vitamin B12) deficiency resulting from a lack of intrinsic factor (IF)
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When B12 levels drop, it can lead to fatigue, cognitive difficulties, mood imbalances, nerve problems, and even anemia
My resting heart rate went up 5 bpm Reported as a mild stimulant-like effect in the first 1 to 2 weeks