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R., Hoesel L
A.KropJ.JordanR.et al (2019)

In contrast, GSSG is less susceptible to decomposition in aqueous solution and is suitable for use in liquid form, although the skin-whitening effect of topical GSSG is unknown

Dall'Era, M
Biochim Biophys Acta - Mol Basis Dis (2012) 1822:136373

Heat accelerates all degradation pathways, but with GHK-Cu it also increases the rate of copper-catalyzed oxidation