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Another key feature is redox modulation

The authors concluded that GHK and GHK-Cu increased epidermal cell stemness and keratinocyte proliferation, also increasing p63 and integrin expression [ 48 , 49 ]

21 KitajimaA.AsatsumaS.OkadaH.HamadaY.KanekoK.NanjoY.et al (2009)

These specific objectives are expected to accelerate the fields progression from proof-of-concept studies toward clinical application

Mass spectrometry identity confirmation: Molecular weight must be verified via LC-MS to confirm the 16-amino acid sequence and the intramolecular disulfide bond, both critical structural features of this compound

As described in more detail here, the fat content of your diet influences the fatty acid profile of skin cells and therefore your susceptibility to oxidative stress