side effects of too much b12 injections Vitamin Too much vitamin B12: Level

Hypponen E, Boucher BJ, Berry DJ, Power C (2008) 25-Hydroxyvitamin D, IGF-1, and metabolic syndrome at 45 years of age: a cross-sectional study in the 1958 British Birth Cohort

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Your body doesn't make B12 on its own, you get it from animal foods (meat, fish, eggs, dairy) or from supplementation

IgM in significant quantity can give you 'Thick Blood' [shocking term] because it increases the plasma viscosity, but that's another story

Typically, whole blood concentrations are measured, and they are about 50 times higher than plasma concentration