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The most common effects are gastrointestinal and dose-dependent

Lung disease research has explored GHK-Cu for idiopathic pulmonary fibrosis and COPD, with animal studies showing reduced fibrosis and improved lung function

Researchers and users exploring GHK-Cu for skin regeneration, post-procedural healing, or longer-term tissue repair often stop their protocol prematurely when discomfort becomes a recurring experience

It is hypothesized to be linked to excessive MMP-1 activity, which could temporarily break down existing collagen faster than new collagen is built

Its most well-characterized mechanism involves stimulating collagen and glycosaminoglycan synthesis in skin fibroblasts, which underlies its effects on skin elasticity, firmness, and wound repair

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