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At the periphery, the production of neopterin and nitric oxide during inflammation consumes tetrahydrobiopterin to the detriment of the hydroxylase enzymes that use this compound as a cofactor.[ref] Genetic variants can also significantly influence BH4 levels when the body is under stress

On the other hand, NAC serves as a precursor to glutathione

Skin dryness and tightness Some users report their skin feeling dry or tight after copper peptide application

It has been shown to stimulate the production of extracellular matrix proteins and promote the growth of new blood vessels, both essential in tissue repair and regeneration