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For the quantification of these metabolites in TIF samples, 5 l samples were extracted in 45 l ice-cold extraction solvent (75% acetonitrile, 25% methanol and 0.1% formic acid) containing isotope-labelled internal standards (36 M 13 C 2 , 15 N-GSH, 0.92 M 13 C 4 , 15 N 2 -GSSG and 10 M D 4 -cystine)

Neuro-imaging studies focusing on individuals with post-acute sequelae of COVID-19 (PASC) have revealed significantly lower-than-normal glutathione levels specifically localized in the frontal gray matter of the brain

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During stress, travel, or illness, these nutrients can be quickly depleted

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