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Rare but Serious Adverse Reactions Even though rare, serious side effects from vitamin B12 can happen
Physical pressure Pressure due to a chinstrap, phone receiver, sports helmet, headband, guitar strap, bra strap, shoulder pads and other tight clothing can lead to acne developing at the point of skin contact
Vitamin B12 deficiency is associated with cognitive problems (problems with thinking, judgment, and learning) and memory issues
Tight junctions Endothelial proteins that tightly connect brain endothelial cells and provide the anatomical bloodbrain barrier with its low paracellular permeability and high transendothelial electrical resistance
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