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Or, more specifically, how one of these enzymes starts to fail with age or persistent illness

doi: 10.3390/biomedicines10112697

Experimental investigations have reported effects on VEGFR2 phosphorylation, focal adhesion kinase (FAK) activation, ERK1/2 signaling, and nitric oxide-associated regulatory pathways

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Obviously, the $$$ grubbing business weasels who sell pharmaceuticals would prefer you throw them out and fork-over for "new ones"

Gamma-glutamyl compounds: substrate specificity of gamma-glutamyl transpeptidase enzymes