l-glutathione pdf vs. Glutathione: What's the Difference? detoxification capacity and protection against oxidative stress L-Glutathione Powder Reduced Free Form

10.1038/nrc3064 188

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In order to visualize the GSH-transporter specific cellular uptake, as well as the in vivo pharmacokinetics and biodistribution of GSH conjugated to a hydrophilic agent, GSH is labelled with the hydrophilic fluorescent dye fluorescein isothiocyanate (FITC) or Cy5.5

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Hsieh TF, Yu KJ and Lin SY: Possible application of raman microspectroscopy to verify the interstitial cystitis diagnosis after potassium sensitivity test: Phenylalanine or tryptophan as a biomarker