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203 Moreover, glutamic acid decarboxylase, an enzyme that transforms glutamate into -aminobutyric acid (GABA), also exists in inhibitory GABAergic neurons

People with liver or kidney disease, pregnant or breastfeeding women, and those with allergies should avoid glutathione injections

PMID 2738168

GHK-Cu (Copper Tripeptide-1) As a biologically active copper-binding tripeptide involved in tissue signaling pathways, GHK-Cu may produce temporary localized redness or mild inflammatory responses in some biological models

Rheum Dis Clin N Am

Yes, especially with stronger topical concentrations, oral supplements, or injectable use