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 Wikipedia Thioredoxin Reductase Assay Kit (Colorimetric) (ab83463) Abcam EZ Glutathione assay kit ITSBio Glutathione Assay (Colorimetric)
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