Side Effects
GHK-Cu demonstrates an excellent safety profile with minimal reported adverse effects. Most common side effects include:
- Mild injection site reactions (redness, swelling, or itching)
- Temporary skin flushing
- Occasional headache
Serious adverse effects are rare. Individuals with copper metabolism disorders (such as Wilson's disease) should avoid GHK-Cu supplementation. Those with active cancer should consult healthcare providers before use, as the peptide's growth-promoting properties warrant caution.
Allergic reactions are uncommon but possible. Discontinue use if significant swelling, difficulty breathing, or severe skin reactions occur.
“The favorable safety profile of GHK-Cu is consistent with what we'd expect from an endogenous peptide — the body already produces and metabolizes it. The primary safety concern remains individuals with copper homeostasis disorders like Wilson's disease, where any exogenous copper source can be clinically significant.”
