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It is a moot point for me as I do not methylate B12 well without self testing for that reality

Exhaled ethane: an in vivo biomarker of lipid peroxidation in interstitial lung diseases

Chen L, Zhou SF, Su L, Song J

the lower limit of quantification (LLOQ) was defined as S/N 10 with an accuracy of 20%

10.1186/s10020-023-00762-y 106 MuraiT.MiyauchiT.YanagidaT.SakoY

PMID 26190572.