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Experimental peptideMostly animalNot FDA approved

PTD-DBM

Protein transduction domain Dvl binding motif peptide

Last reviewed October 27, 2026 · 8 sources · Written for general readers · Compare with another compound →

The bottom line

PTD-DBM is an experimental peptide designed to switch on Wnt, a signal hair follicles and healing skin need.[1][2] It helped hair regrow and wounds heal in mice, but no study has tested it in people.[3][4][5][1] It has no FDA approval, and products that claim to regrow hair count as drugs under FDA rules.[6]

Where the evidence stands

What it is

PTD-DBM is a lab made peptide. Its full name is protein transduction domain Dvl binding motif. The first part helps it get inside cells, and the second part blocks one protein from grabbing another.[1][5]

It was first described in a 2015 wound healing study, then tested for hair loss in 2017. Published tests so far are in cells, human tissue samples and mice, nearly all from one research group.[2][3][4]

It has no approved medical use. FDA says products that claim to restore hair growth are drugs, not cosmetics.[6]

Name
PTD-DBM (Protein transduction domain Dvl binding motif peptide)
Other names
CXXC5 Dvl blocking peptide
Type
Experimental peptide

How it works

Hair follicles and healing skin need a growth signal called Wnt. A protein called CXXC5 acts as a brake on that signal.[1][2]

  • CXXC5 slows the signal by binding to a protein called Dishevelled (Dvl).[1]
  • PTD-DBM is designed to block that binding, which releases the brake and lets the growth signal run.[1]
  • In scalp samples from people with pattern baldness, bald areas had more CXXC5 than areas with hair, with an opposite pattern for a key Wnt signal protein.[1]
  • In fresh human wounds, skin cells had less CXXC5, and mice lacking CXXC5 healed skin wounds faster with more collagen.[2]
  • A 2023 mouse study linked CXXC5 to hair loss driven by DHT (a strong form of testosterone) through a molecule called prostaglandin D2.[4]

This pathway rests on work from one research group in cells and mice. It has not been confirmed in people.

What the research shows

We keep animal and human evidence apart. A result in animals is a reason to study something in people, not proof that it works in people.

Animal and lab studies

Hair regrowth and wound healing in mice, from one research group

  • In mice whose hair was in a resting phase, blocking the CXXC5 and Dvl link helped hair follicles grow again.[3][1]
  • Pairing PTD-DBM with valproic acid, a seizure drug, boosted regrowth and new follicle formation in healing wounds more than either alone.[3][1]
  • In the 2023 hair study, the peptide was applied to mouse skin and reversed hair loss caused by prostaglandin D2.[4]
  • In a 2015 study, PTD-DBM raised Wnt activity and collagen production in cells, and together with valproic acid it sped skin wound healing in mice.[2]
  • In a 2023 study, a sticky hyaluronic acid patch carrying PTD-DBM, valproic acid or both promoted regenerative healing in mouse wounds, reduced scarring and raised collagen III, which the authors link to regenerative healing.[5]
  • In cell studies, it raised the activity of dermal papilla cells, the cells at the base of a hair follicle that steer growth, when combined with other Wnt boosters.[1]

Limit: Mouse hair cycles and wounds differ from human baldness and human scars, and an expert commentary noted the work did not directly test male pattern hair loss.[1]

Human studies

No human studies

  • We found no published study of PTD-DBM given to people. The only human material used was donated scalp and wound tissue examined in the lab.[1][2] A 2017 expert commentary noted it was still unknown whether the peptide could be used on human scalp.[1]

Limit: With no human data, nothing is known about whether it works in people or what side effects they would have.

Claims check

The most common claims about this compound, and what studies actually found. Verdicts rate the evidence, not whether you should use it.

Regrows hair in male or female pattern baldness

Only in animals

In mice whose hair was in a resting phase, blocking the CXXC5 and Dvl link with the peptide helped hair follicles grow again.[3] In a 2023 study, the peptide applied to mouse skin reversed hair loss caused by prostaglandin D2, a molecule linked to DHT driven hair loss.[4] An expert commentary noted the work did not directly test human pattern hair loss.[1]

Grows new hair follicles

Only in animals

In healing mouse wounds, pairing PTD-DBM with valproic acid, a seizure drug, boosted formation of new follicles more than either alone.[3] No study has tested this in people.

Speeds wound healing and reduces scars

Only in animals

In mice, combining PTD-DBM with valproic acid sped up skin wound healing more than either alone.[2] A 2023 mouse study loaded both into a sticky gel patch and found more regenerative healing and significantly less scar formation.[5] There are no human wound studies.

Works as well as minoxidil or finasteride

Not tested

No study has compared PTD-DBM with approved hair loss drugs in people. It has never been tested in a human at all.[1]

Known risks and side effects

  • Untested in people. No human safety data exist, so side effects, allergy risk and long term effects are unknown.[1]
  • Paired with another drug. Many of the strongest mouse results paired the peptide with valproic acid, a prescription drug with many effects of its own.[1][2]
  • Turns up a growth signal. The peptide works by releasing a brake on Wnt, a powerful growth signal. Its long term effects of doing that in human tissue have not been studied.[1][2]
  • One lab, early stage. The published work comes mainly from one research group and has not been repeated by independent teams in people.[3][4][5]
  • Unregulated products. Hair growth claims make a product a drug. PTD-DBM has no FDA approval and is not on FDA's compounding lists, so any product sold for hair loss has not been reviewed by FDA for safety, quality or effect.[6][7]

Regulatory status

Today: PTD-DBM is not approved by FDA for any use and does not appear on FDA's compounding category lists.[7] Products sold for hair regrowth would count as drugs.[6] It is not named on the WADA 2026 Prohibited List.[8]

Sources

  1. Kim D, Garza LA. The Negative Regulator CXXC5: Making WNT Look a Little Less Dishevelled. J Invest Dermatol. 2017;137(11):2248-2250. PMID 28967390
  2. Lee SH, Kim MY, Kim HY, Lee YM, Kim H, Nam KA, et al. The Dishevelled-binding protein CXXC5 negatively regulates cutaneous wound healing. J Exp Med. 2015;212(7):1061-1080. PMID 26056233
  3. Lee SH, Seo SH, Lee DH, Pi LQ, Lee WS, Choi KY. Targeting of CXXC5 by a Competing Peptide Stimulates Hair Regrowth and Wound-Induced Hair Neogenesis. J Invest Dermatol. 2017;137(11):2260-2269. PMID 28595998
  4. Ryu YC, Park J, Kim YR, et al. CXXC5 Mediates DHT-Induced Androgenetic Alopecia via PGD2. Cells. 2023;12(4):555. PMID 36831222
  5. Lee SH, An S, Ryu YC, Seo SH, Park S, Lee MJ, Cho SW, Choi KY. Adhesive Hydrogel Patch-Mediated Combination Drug Therapy Induces Regenerative Wound Healing through Reconstruction of Regenerative Microenvironment. Adv Healthc Mater. 2023;12(18):e2203094. PMID 36854308
  6. US Food and Drug Administration. Is It a Cosmetic, a Drug, or Both? (Or Is It Soap?). FDA
  7. US Food and Drug Administration. Bulk Drug Substances Nominated for Use in Compounding Under Section 503A of the FD&C Act (category lists). Updated May 14, 2026. FDA category list
  8. World Anti-Doping Agency. The 2026 Prohibited List. WADA
Medical disclaimer

This page is educational information only. It is not medical advice and does not replace care from a licensed medical provider. Do not use this page to decide whether to take any substance. Talk to a licensed medical provider first.

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