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Yes, too much heat damages glutathione, reducing its strength

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Of significance, there is growing evidence that the reversible formation of mixed disulfides between GSH and low-pKa cysteinyl residues of proteins ( S -glutathionylation) is an important mechanism for dynamic, posttranslational regulation of a variety of regulatory, structural, and metabolic proteins, and for the regulation of signaling and metabolic pathways in intact cell systems (Dalle-Donne et al., 2007

Lactate sensitive transcription factor network in L6 cells: activation of MCT1 and mitochondrial biogenesis