The theory is that such products purge skin from clogs stuck deep in the pore, pushing them quickly to the surface
GHK-Cu (Gly-His-Lys copper complex): A naturally occurring tripeptide that binds copper(II) ions, investigated for its role in tissue remodeling, antioxidant responses, and skin regeneration
2017 Feb Neetu Kataria, Poonam Yadav, Rajesh Kumar, Niraj Kumar, Mritunjai Singh, Ravi Kant, Vasantha Kalyani
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PMID 12818476
A combination of vitamin D and L-cysteine administration significantly augmented GSH levels and lowered oxidative stress and inflammation (308, 309)