Whats the best blood test for riboflavin? , Unfortunately, the gold standard is the erythrocyte glutathione reductase activity coefficient EGRAC, but no one offers this. Some labs offer Glutathione Reductase (GR) Activity Assay Kit Regulatory Mechanism of Glutathione Reductase Activity in Human Red Cells ScienceDirect PDF) Optimal and stable conditions for the determination of erythrocyte glutathione reductase activation coefficient to evaluate riboflavin status
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