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Because GHK-Cu appears frequently in copper peptide research discussions and catalog references, this product may be compared with related research peptides and blends to evaluate similarities and differences in pathway behavior, molecular structure, cellular response, peptide-metal complex signaling, and structure-function relationships
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it is naturally occurring, nontoxic, and is active at a very low nanomolar concentration.11 Another piece of research described GHK-Cu as a safe, inexpensive, extensively studied compound.3 These conclusions primarily apply to topical GHK-Cu, but even with injectables, the lack of serious adverse events in animal subjects points to a general tolerability regardless of the route of administration
PubMed , Toxicology and Applied Pharmacology , vol
L.et al (2009)
Long answer: Like any supplement, misuse, excessive dosing, or poor product quality can create risk
