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L-Arginine and L-Citrulline
The gamma-glutamyl cycle does allow some tissues (particularly the liver, kidney, and lung epithelium) to utilize extracellular glutathione more directly via membrane transporters
10.1007/s10620-008-0332-9 130 SkorjanecS.KokotA.DrmicD.RadicB.SeverM.KlicekR.et al (2015)
Product Properties Kit Components Assay Buffer Chromogen Substrate Features & Benefits Determination of GST activity in serum, plasma, plant tissue/cell lysates and other biological fluids
Ehlers, R
Conclusion The question of whether a glutathione supplement "really works" comes down to the science of delivery
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