Saline (0.9 percent NaCl) should be avoided because chloride competes for Cu(II) coordination and destabilizes the GHK-Cu chelate
Several amphiphilic PSs have also been shown to quench the intrinsic tryptophan fluorescence of albumin, such as dihematoporphyrin ether [70], benzoporphyrin derivative [21], Protoporphyrin IX (PPIX) [20], Protoporphyrin IX dimethyl ester (PPIXDE) [13], Chlorin e6 [14], glycosylated porphyrin, chlorin, isobacteriochlorin [71], and purpurin-18 [72]
Why it fails for multi-dose peptide vials: Once the seal is punctured, there's no preservative inhibiting bacterial growth
Dihexa has gained scientific interest due to its unique biochemical profile and potent binding properties related to cellular mechanisms, synaptic growth, and neuronal differentiation (Wikipedia: Dihexa)
Higher fibroblast density at the repair site correlates with faster structural closure of tendon defects in preclinical histology