1000 mg glutathione per day L-Glutathione 1000mg Tablets – Liver & Antioxidant Support, UV Protection, 120ct S-Acetyl L-Glutathione 100 mg, 60

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A GHK-Cu serum should list the peptide concentration (look for 1% or higher) and the rest of the ingredient list has to be short

doi: 10.3390/molecules26030752 180 ManikM.SinghR

GHK-Cu, on the other hand, works through regenerative pathways enhancing collagen, reducing inflammation, and protecting against oxidative stress

Unlike other skin peptides targeting specific receptors, GHK-Cu works as a signaling molecule binding to discoidin domain receptors, activating fibroblasts broadly rather than targeting a single pathway