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However, GI side effects including GI bleeding may occur, particularly at high doses or with long-term use

Acta 412 , 12971305 (2011)

In preclinical research, this peptide has shown promising potential in supporting tissue regeneration, angiogenesis (new blood vessel formation), and cellular signaling related to healing

And it delivers copper to enzymes called lysyl oxidase and lysyl hydroxylase, which are responsible for cross-linking collagen fibers into strong, stable structures

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GHK-Cu is not approved for human or veterinary use by any regulatory agency