What it is
GHK-Cu is a small tripeptide (glycyl-L-histidyl-L-lysine) that naturally binds copper. Levels of it in human plasma decline notably with age, which is part of why it is so heavily researched.
How it's described to work
Research describes GHK-Cu as a signaling molecule involved in collagen and elastin expression, antioxidant activity, and the normal remodeling process that follows tissue stress.
What research discusses it for
Skin qualityCollagen researchHair and scalp researchAntioxidant support
Important context
Most GHK-Cu literature involves topical or research settings. Education only — not a treatment recommendation.