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Its expression is significantly increased in lung adenocarcinoma, downregulated in gastric and colorectal cancers and altered during the differentiation of pluripotent embryonic stem cells (Liu et al., 2017

Rankings are based on the strength of mechanism-of-action evidence behind each peptide, the safety profile and current legal/regulatory status of each compound, how well each one matches specific healing-specific use cases (tendon, muscle, skin, immune, joint), the typical dosing protocols and administration burden involved, and the sourcing and purity standards reported by vendors

Chemical Name: GHK-Cu (Glycyl-L-Histidyl-L-Lysine-Copper Complex) Molecular Formula: C14H24CuN6O4 Sequence: 3-amino acid tripeptide with copper chelation Research Applications: Wound healing and tissue repair studies Collagen synthesis pathway research Anti-aging and skin regeneration mechanisms Angiogenesis and vascular formation studies Antioxidant enzyme activity research Fibroblast proliferation and migration protocols Gene expression modulation in tissue remodeling Product Specifications: Form: Lyophilized powder Purity: High purity research grade Molecular Weight: 404.0 g/mol Storage: Store at -20C, protect from light and moisture Reconstitution: Use bacteriostatic water (not included) Stability: 24 months when stored properly, 14 days once reconstituted Research Background: GHK-Cu is a naturally occurring copper-binding tripeptide originally identified in human plasma and extensively studied for its role in tissue repair and regeneration

Conflicts of interest Both authors declare that there is no conflict of interest

Back Madsen, OD, Karlsen, C, Blume, N, et al (1995) 'Transplantable glucagonomas derived from pluripotent rat islet tumor tissue cause severe anorexia and adipsia', Scandinavian Journal of Clinical and Laboratory Investigation Supplement , 220, 27-35