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.
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.