When people ask about peptides for hair, the conversation is dominated by copper peptides, and specifically GHK-Cu. The important caveat is that the strongest human evidence for hair and skin is topical and cosmetic, while injectable use is community-driven with little clinical dosing data.
Reviewed for accuracy · Last reviewed July 7, 2026The compounds below are the ones most discussed for hair growth. Each links to its full profile, where the dosing, side effects, and sources live. They are ordered roughly by how much human evidence sits behind them, not by a claim that any one works.
This is a genuinely thin category for injectable peptides. GHK-Cu is the one with a real research history, but that history is mostly about topical application and skin regeneration rather than injected hair-growth protocols. Claims that injecting a peptide will regrow hair run well ahead of the evidence.
For hair specifically, established topical treatments have far more clinical support than any injectable peptide. Treat peptide hair-growth marketing skeptically, and remember that GHK-Cu's blue color when reconstituted is normal (it comes from the copper), not a quality signal either way.
This page is an independent educational reference and is not medical advice, and does not indicate any approval status for any use. Talk to a doctor before starting any compound.