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Methylcobalamin is a naturally occurring, readily usable form, while cyanocobalamin is a poorly absorbed synthetic version produced using cyanide molecules
Its still the one Id pick if you want options beyond a needle
This suggests that B12 deficiency has detrimental effects on immune function and myelin production at younger ages [127]
Deficiency of vitamin B12 may cause tiredness, weakness, constipation, loss of appetite, weight loss and megaloblastic anemia (a condition when red blood cells become larger in size than normal)
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