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Autoimmune Conditions : Certain peptides can trigger immune responses, so those with autoimmune disorders should only proceed under close medical supervision

The glutathione pKa refers to the acid dissociation constant of its functional groups

doi: 10.1186/1479-5876-11-210 213 FliserDZeierMNowackRRitzE

This copper-binding motif is critical: the apo-peptide (GHK without copper) shows substantially reduced biological activity in most in vitro assays, indicating that the metal center is required for receptor interaction and downstream signaling

However, this point may be irrelevant given that the preponderance of available evidence renders such a study unnecessarily risky and thus unethical