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GHK-Cu is a copper-chelated tripeptide with distinct mechanisms Advantages Broader preclinical evidence base across multiple organ systems Disadvantages No topical cosmetic applications, not naturally occurring in plasma Matrixyl (Palmitoyl Pentapeptide-4)Moderate - Both used in anti-aging skincare Differences Matrixyl is a synthetic pentapeptide signaling fragment

Fits when pigment with photoprotection sits alongside skin-quality goals

doi: 10.3390/ijms18102046 65 Witkowska-SdekEPyrakB

10.1007/s00441-019-03016-8 23 HangaiM.YoshimuraN.HiroiK.MandaiM.HondaY

"Toxic hepatitis induced by show-wu-pian, a Chinese herbal preparation"

Rinnerthaler and colleagues, vitamin C does its part by reducing oxidized tocopherol, while glutathione preserves vitamin E, salvaging its own natural manufacturing process