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Reconstitute away from direct light and use glass or high-grade polypropylene labware, avoiding prolonged contact with chelating or metallic surfaces that can strip Cu(II) from the tripeptide
Where the component evidence is strongest and weakest GHK-Cu is the best-characterized of the four, with a substantial mechanistic and topical-skincare literature behind it which makes it a reasonable anchor to build a blend around
International Journal of Cosmetic Science , 41(5), 465-474
Its full sequence is Tyr-Ala-Asp-Ala-Ile-Phe-Thr-Asn-Ser-Tyr-Arg-Lys-Val-Leu-Gly-Gln-Leu-Ser-Ala-Arg-Lys-Leu-Leu-Gln-Asp-Ile-Met-Ser-Arg-NH2, with a molecular weight of approximately 3,358 Da
Dispense product onto fingertips, then press into forehead, each cheek, nose, and chin
This approach maintains more consistent peptide levels throughout the day
