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What does GHK-Cu do, and do I use it topically or as an injection?
Evidence
GHK-Cu is a copper-binding tripeptide with wound-healing and skin research, mostly in models and small topical studies. The looks data lives on the skin, not in a pin. Injectable GHK-Cu is community practice, not a well-studied medical route for appearance.
Anecdote
People inject it because “peptides go in a pin.” That does not mean the topical skin papers transfer to a subcutaneous dose.
Follow-up · Are you chasing texture and scars, or running it as part of a peptide stack?
