# GHK-Cu FAQ: Collagen, Hair, Safety and Side Effects

> GHK-Cu questions answered from the research record: what it does, collagen and hair evidence, side effects, what not to mix it with, and whether copper peptide is safe. Cited, plain-spoken.

Twenty-two questions about the copper tripeptide, each answered first and cited second. Where a claim is quantitative, it points to a study.

## Definition and mechanism

These answers describe what the published literature reports about GHK-Cu and never recommend a dose or a course of use. GHK-Cu is a research peptide; topical Copper Tripeptide-1 is a cosmetic ingredient, while injectable and systemic use is unapproved and research-only.

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A weathered dispensary of the GHK-Cu copper-tripeptide record — every collagen assay, skin trial, and hair-count result read for what it shows and where it stops, with no clinic behind the counter and nothing on these shelves to buy.