Fluids Barriers CNS 20 , 87 (2023)
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Any specific decimal-precision number cited without a human PK study should be treated as speculative
Mechanistically, GHK-Cu appears to act through several pathways: Collagen and elastin remodeling: Gene array work by Finkley et al., reported in the second edition of Cosmeceuticals and Active Cosmetics (Taylor and Francis, 2005), examined GHK-Cu effects on human fibroblast cultures across a nanomolar to low micromolar concentration range and found upregulation of decorin, collagen, and elastin-associated genes
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This powerful antioxidant composed of amino acids can assist with slowing the aging process, help with athletic recovery, streamline detoxification, and much more