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Loren Pickart's 2008 review in the Journal of Biomaterials Science collected the earlier work: GHK-Cu increases collagen and glycosaminoglycan production by fibroblasts, attracts immune and repair cells to wound sites, and influences the enzymes that degrade old matrix (PubMed 18644225)

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If you redo a test to get a different answer, like an extra drug level, do not use modifier 91

Both intact drug and drug metabolites are then transported to the liver, where they can be further metabolized before reaching systemic circulation and reducing the drugs bioavailability