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It is a 16amino-acid fragment from the C-terminal region of human growth hormone (often described as hGH 177191)
Using them as part of a holistic approach will give you the best results
GHK-Cu and Extracellular Matrix Research Research confirms that GHK stimulates synthesis of collagen, dermatan sulfate, chondroitin sulfate, and the small proteoglycan decorin, while also modulating metalloproteinase activity and their inhibitors making it a key compound in extracellular matrix research
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