# GHK-Cu FAQ: Skin, Hair, Safety, and Research Questions

> GHK-Cu questions answered from the research: collagen production, hair growth, safety, retinol comparison, and the data gaps. Every answer in this GHK-Cu FAQ is cited to a published study.

Common GHK-Cu questions answered directly from the published literature — each answer tied to a study, the gaps named where the data stops.

## Common GHK-Cu Questions

Every question below is answered from the reviewed GHK-Cu literature, with a citation wherever the answer is quantitative.

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A product-readout of the GHK-Cu research, every claim shipped with its source and every gap flagged in plain view — no clinic behind the panel and nothing here on sale.