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A 2023 peer-reviewed study in the Journal of Cosmetic Dermatology confirmed that GHK-Cu and hyaluronic acid together produce a synergistic effect on collagen IV upregulation, enhancing anti-aging outcomes beyond what either ingredient achieves alone

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Marissa Liza: I'm sorry, I've heard of the stack that I did not know that that was Yeah, Sam Rhee: and we won't talk about it, but just very briefly, it's, um, a synthetic peptide, which is, um, again, a fragment of a natural occurring protein, just like BPC 157