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A., Sinclair, L

This could be due to racial differences in B12 metabolism, or in environmental factors, most obviously diet (B12 intake)
PLOS Medicine publishes research and commentary of general interest with clear implications for patient care, public policy or clinical research agendas

Systematic monitoring helps optimize protocols and confirm effectiveness

S.DinkinsM
You don't know the purity, you don't know if there are contaminants, and you can't trust your data
