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Description
"Association of Vitamin B12 Deficiency with Homozygosity of the TT MTHFR C677T Genotype, Hyperhomocysteinemia, and Endothelial Cell Dysfunction"

So heres the complete, straight-shooting picture

The effective potency could be a fraction of what the label states

furosemide) can increase urinary excretion of thiamine and thereby lower B levels over time

Although surprising, athletes are at a greater risk of deficiency
