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The effect of copper tripeptide and tretinoin on growth-factor production in a serum-free fibroblast model

Because they work through different mechanisms -- GHK-Cu through broad gene modulation and copper-dependent enzymatic activity, Matrixyl through collagen signal mimicry -- they can be combined for synergistic anti-aging benefits

The cost differential between gray-market products and regulated pharmacy compounding is substantial enough that even a favorable PCAC outcome would not eliminate gray-market competition