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Some of these injectable peptides, including injectable GHK-Cu, are listed as a category 2 substance, meaning they have safety risks and cannot currently be compounded for purchase by a pharmacy

GHK-Cu acts at the extracellular matrix (ECM) level, modulating the balance between matrix metalloproteinases (MMPs) and their inhibitors (TIMPs) to regulate collagen turnover, and stimulating fibroblasts to produce collagen type I, collagen type III, and elastin

They are not approved as medicines and make no therapeutic claim

Proposed mechanisms include: Enhancing cellular communication Supporting local growth factor expression Modulating nitric oxide pathways for circulation While promising, its important to note that human trials remain limited , and more research is needed before drawing definitive conclusions