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Copper ions alone (not the peptide) have demonstrated up to 90% inhibition of type 1 5-alpha reductase in laboratory settings

This is not placebo: GHK-Cu upregulates glycosaminoglycan synthesis, including hyaluronic acid and dermatan sulfate, which directly increase skin hydration at the dermal level

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Copper peptides have an affinity to skin tissues, and with their potential to support normal skin functioning at a cellular level, it's become a highly sought-after compound for skin care routines that target collagen production for firmer-looking skin, hair growth, and skin clarity

Cur is able to activate Nrf2/Keap1/ARE signaling pathway by Michael reaction with thiol residues in Keap1, inducing the release and activation of Nrf2 and promoting antioxidant effects (Wafi et al., 2019

For the broader picture of which peptides already have FDA approval, see our FDA Approved Peptides List 2026