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The limitation of standard topical GHK-Cu is skin penetration depth: without penetration-enhancing excipients or palmitoylation (as in Pal-GHK), absorption to the deeper dermal layers where collagen-producing fibroblasts reside is limited
In addition, S-Acetyl glutathione has been found to increase intracellular glutathione and improve many biomarkers of oxidative stress
Evidence that glutathione peroxidase [PMID: 7126177] Laboratory literature summary: Glutathione S-transferases of the bovine retina
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