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While HQ showed a dissociation constant 90-fold higher than L-tyrosine, KA exhibited a value of nearly 4000-fold higher than the natural substrate

(PubMed) Meydani SN, Leka LS, Fine BC, et al

GHK-related modulation of matrix metalloproteinase-2 expression

A medical consultation and health screening help ensure IV therapy is safe and appropriate for your individual needs

Cell 10 , 25072518 (1999)

If your creatinine has risen after starting a glutathione supplement, the far more likely explanation is dehydration, a concurrently started supplement (creatine monohydrate being the most common culprit), an NSAID, or an underlying kidney issue that needs medical evaluation not the glutathione itself