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Degraded Product: A copper peptide serum that has turned brown or greenish-brown isn't "still fine." That colour change indicates oxidation - the copper has dissociated from the peptide, and you're now applying something that may cause irritation without delivering benefits
Reconstituted solution should be kept at 2-8C and used within 4 weeks
hence establishing the link between preclinical mechanistic knowledge and clinical decision-making (238)
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By reducing this oxidative load, glutathione helps preserve skin structure and radiance
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