The copper-binding ability of GHK is one of the reasons the peptide has become so heavily researched in dermatology and regenerative biology
As a synthetic fragment of human GH residues 176-191, it allows researchers to study the metabolic arm of GH signalling independently of IGF-1 pathway activation
For reconstituted peptides, freeze-thaw damage is particularly severe
Most considerations of non-animal alternatives for skin irritation/sensitization testing tend to examine a single aspect of the process (e.g., chemical reactivity, epidermal bioavailability, dendritic cell responses)
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