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The eye area benefits from lower 1-2% concentrations, while normal facial skin can use 2-4%

As a research-grade reference material, our GHK-Cu is supplied as a lyophilized powder with peptide purity of 99.5% by HPLC and copper content verified by inductively coupled plasma mass spectrometry (ICP-MS)

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Since then, numerous studies have demonstrated that GHK-Cu improves wound healing and tissue regeneration and stimulates collagen production

The blue-green color comes from the copper

While both compounds demonstrate remarkable individual efficacy and work through complementary mechanisms that theoretically could synergize, the complete absence of clinical trial data makes any combination approach purely experimental