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(2019) 29:44356.e5
Beyond 6 months, your provider may want to check zinc levels and liver function
10.1016/j.cell.2008.05.054 33 SunY.KangC.LiuF.ZhouY.LuoL.QiaoH
Look for products with: Stated GHK-Cu concentration (not just contains copper peptides) Opaque or tinted packaging to protect from light Reasonable formulation that doesnt include strong acids in the same product Cool storage recommendations followed Documented stability or third-party testing where available Avoid products with: Vague active ingredient labels Clear bottles in bright store displays (probably degraded) Very low GHK-Cu concentrations buried in proprietary blends Prices that dont match concentration or brand quality Key Takeaway: Injectable GHK-Cu protocols typically use 1 to 5 mg subcutaneously several times per week, but published evidence for this route is limited Can I Combine GHK-Cu with Other Actives
So if dullness, dark spots, and sensitivity are getting a little too familiar, glutathione might just be the ingredient you need to add to your skincare regimen
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