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Catalpol enhances the expression of adenosine 5-monophosphate (AMP)-activated protein kinase (AMPK) in the skeletal muscle of diabetic rats, improving glucose metabolism, maintaining glucose homeostasis, and enhancing insulin sensitivity (Shen, 2023

This study established the foundational mechanism linking GHK-Cu to collagen synthesis and is among the most cited references in the copper peptide literature

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This is a hot area of research for 2026, and several promising strategies are emerging

The gradual dose escalation protocol specifically aims to minimize these effects while building therapeutic benefit

GHK-Cu regulates MMP expression and activity, increasing some MMPs to remove damaged matrix while controlling excessive degradation