Ingredient or product comparison
Topical vs Injectable for Hair
GHK-Cu is available in both topical and injectable formats. For hair-specific applications, the delivery route matters — and the evidence strongly favors topical.
This source-based comparison does not add ratings or recommend a winner.
- GHK-Cu is available in both topical and injectable formats. For hair-specific applications, the delivery route matters — and the evidence strongly favors topical.