Peptides for Hair Growth and Thickness
Best peptides for hair growth and thickness is a short list because it is dominated by one molecule: GHK-Cu, the copper tripeptide, followed by PTD-DBM.
If you would like to order GHK-Cu or PTD-DBM, you will need to create a free account and purchase from an online supplier.

I discovered GHK-Cu after noticing more of my scalp was visible at the back of my head, around the crown. I’m in my early 40s and my hair has been gradually thinning for years — but by this point it had become apparent in almost every picture of me. A co-worker in Vancouver suggested I look into copper peptides and pointed me to a lot of the GHK-Cu literature.
I was hesitant, but I decided to photograph both my front hairline and my crown under the same lighting conditions, so I’d have a reference point to evaluate progress against.
I didn’t see immediate results. After approximately three months, though, the comparison photos showed improvement: my hair appeared somewhat thicker around the crown, and there were numerous short, fine hairs coming in along parts of my hairline.
GHK-Cu didn’t produce overnight success — hair changes happen over a long period, and I can’t definitively say it was solely responsible for everything I observed in that window. But after five months, the difference between the two sets of photographs was enough that I’m continuing to monitor developments as the research goes on.
Michael Turner, Vancouver, Canada
Shared with permission. One person’s self-reported experience — a report, not evidence: no controls, no blinding, and other factors can’t be ruled out. Compounds discussed are sold strictly for non-human research use.
REVIEWED BY
Marcus Reinhardt — Chemical Researcher, Lead Analyst & Peptide Research Advisor
Marcus Reinhardt is a chemical researcher specializing in sustainable materials and advanced formulation science, with research experience in compound development and health optimization. He reviews all Peptide Insider educational content for scientific accuracy, strength of supporting evidence, and practical relevance. Editorial team.
What are the best peptides for hair growth?
GHK-Cu is one of the most researched peptides in hair-follicle studies and is often the first name that comes up. Other compounds being studied include PTD-DBM, which targets the Wnt signaling pathway, and zinc-thymulin. The same follicle evidence is why GHK-Cu anchors our guide to peptides for lash growth.
Research is still developing, and these compounds should not be considered proven treatments for hair loss.

Does GHK-Cu work for hair growth?
The follicle data is real but almost entirely preclinical. A 2007 study found a tripeptide-copper complex increased human follicle growth in vitro, and a 2017 Journal of Investigative Dermatology paper showed PTD-DBM stimulated hair regrowth and wound-induced neogenesis in mice. Human evidence exists only in combination protocols. The table below is a straight forward summary of the limited evidence:

| Finding | Model |
|---|---|
| Copper complex increased follicle growth | Human follicles, in vitro (2007) |
| PTD-DBM stimulated regrowth and neogenesis | Mouse (JID, 2017) |
| Copper peptides aided regrowth with minoxidil and dutasteride | Small human combination study (2025) |
| No standalone human trials of GHK-Cu for hair | None |
What this evidence does not cover
No published human trial has tested GHK-Cu or PTD-DBM alone for hair growth, and neither is FDA approved. Research vials are not the cosmetic serums sold under similar names; anything sold promising thicker hair is grey market by definition. A batch-matched third-party COA would be the bare minimum before purchasing these for research purposes.
Primary sources
- The effect of tripeptide-copper complex on human hair growth in vitro — Pyo et al., Archives of Pharmacal Research, 2007
- Targeting of CXXC5 by a competing peptide stimulates hair regrowth — Journal of Investigative Dermatology, 2017
- Minoxidil-dutasteride-copper peptide combination regrowth study, 2025
What do hair growth peptides cost per mg?
GHK-Cu is one of the cheapest peptides per mg because it ships in large vials: expect $40 to $70 for 50mg. PTD-DBM is far pricier, often $60 to $100 for 5mg.
Prices far below those ranges usually means skipped testing, falsified COAs, or they are under-filling the vials.

When will I get my order?
- Depending on the vendor you order from, shipping typically takes:
- Amino Club: 3 to 5 Business Days
- EZ Peptides: 5 to 7 Business Days
- Ascension: 5 to 7 Business Days

Ready to order GHK-Cu?
Research use only. Third-party tested, shipped in 3 to 5 business days.