Why people look at peptides for hair
Most of the hair-growth interest in peptides comes down to one idea: copper. Copper peptides like GHK-Cu and AHK-Cu carry copper to the skin and scalp, and copper is involved in the signaling around hair follicles. A separate compound, PTD-DBM, gets attention for a different reason: it targets the Wnt pathway, which helps decide whether a follicle stays dormant or starts a new growth cycle.
Here is the honest part. The human evidence for any of these as a hair-growth treatment is early and limited. A lot of what you will read online leans on lab studies, animal work, and small skin-care trials, not large head-to-head hair trials in people. So treat this as research, not a guaranteed fix. These are sold for research use only, and nothing here is medical advice.
People use copper peptides two ways: topically (a serum or cream on the scalp) and as a reconstituted solution. Topical is the more common, lower-commitment route and the one most of the skin and scalp research used. Whatever route you are weighing, the thing you actually control is what you pay and whether the vial was tested. That is what we focus on.
The rundown: five compounds people compare
GHK-Cu (the copper peptide most people start with)
GHK-Cu is the best known copper peptide. It shows up in skin-care research for collagen and wound repair, and that same tissue-remodeling angle is why people try it on the scalp, usually as a topical serum. The hair evidence specifically is thin, but it is the most studied of the group for skin. On our data, the best price we have logged is $35/50mg = $0.7/mg (EZ Peptides), and the top certificate of analysis we have seen reports 99.991% purity. See the GHK-Cu page for current listings.
AHK-Cu (the other copper peptide)
AHK-Cu is a second copper tripeptide that comes up in hair conversations, again largely on the copper-delivery logic and small skin studies rather than big human hair trials. It is less common and generally pricier. The best price we have logged is $42 (Next Gen Peptides). We do not yet have a verified certificate of analysis purity on file for it, which is worth knowing before you spend. Details on the AHK-Cu page.
PTD-DBM (the Wnt-pathway one)
PTD-DBM is the compound behind a lot of the newer hair buzz because it works on the Wnt signaling pathway tied to follicle cycling, often discussed alongside topical valproic acid in research settings. It is the most experimental name on this list and the evidence in humans is very early. We list it for comparison, but we do not have a verified price or certificate of analysis on file yet, so treat it as one to watch rather than buy on impulse. See the PTD-DBM page.
GHK (the copper-free version)
GHK is the same core tripeptide as GHK-Cu but without the bound copper. It comes up when people want the peptide backbone without adding copper, or want to control copper dosing separately. We track it for comparison, though we do not have a verified price or certificate on file for it right now. See the GHK page.
TB-500 (the recovery one people ask about)
TB-500 is a tissue-repair and recovery peptide that gets pulled into hair threads because of its general healing reputation, but the direct hair evidence is the weakest of anything here. We include it because people ask. The best price we have logged is $42/10mg = $4.2/mg (Next Gen Peptides), with a top certificate of analysis purity of 99.872%. It is by far the most expensive per milligram on this page. See the TB-500 page.
| Compound | Hair angle | Best $/mg we logged |
|---|---|---|
| GHK-Cu | Copper peptide, most studied for skin | $0.7/mg (EZ Peptides) |
| AHK-Cu | Second copper peptide | $42 (Next Gen Peptides) |
| PTD-DBM | Wnt pathway, very early evidence | Mention only, no verified price yet |
| GHK | Copper-free version of GHK | Mention only, no verified price yet |
| TB-500 | Recovery peptide, weakest hair link | $4.2/mg (Next Gen Peptides) |
How to choose and not overpay
The headline price on a vial tells you almost nothing until you do the math. A bigger vial can look expensive and still cost less per milligram. That is why we convert everything to a per-milligram number. GHK-Cu at $0.7/mg and TB-500 at $4.2/mg are both on this list, but one is six times the other before you factor in anything else.
- Compare on price per milligram, not sticker price. The vial size hides the real cost.
- Insist on a certificate of analysis. For GHK-Cu we have seen a top purity of 99.991% on the COA, and for TB-500 a top purity of 99.872%. For AHK-Cu, GHK and PTD-DBM we do not yet have verified purity on file, so the burden is on the vendor to show you one.
- Match the COA to the batch. A purity number is only useful if it belongs to the lot you are actually buying.
- Be skeptical of the cheapest unverified vial. No certificate is a reason to pause, not a discount.
Dosing here is deliberately qualitative. We are not going to hand you a milligram protocol for an unproven hair use. Topical copper-peptide serums are the lower-commitment route most of the research used, and anything beyond that is a conversation for a clinician, not a blog.
The bottom line
If you want to experiment, GHK-Cu is the reasonable starting point: it is the most studied copper peptide for skin, it has the lowest price per milligram on this page at $0.7/mg, and it has a strong COA on file at 99.991%. AHK-Cu and PTD-DBM are the more speculative picks, and TB-500 has the weakest hair link and the highest cost. Whatever you choose, run the per-milligram math and ask for the certificate first.
Frequently asked.
Do peptides actually regrow hair?
Honestly, the human evidence is early and limited. Copper peptides like GHK-Cu have skin and wound-repair research behind them, and PTD-DBM has lab interest around the Wnt pathway, but there are not large head-to-head human hair trials proving regrowth. Treat these as research-use compounds to experiment with cautiously, not a proven treatment, and talk to a clinician about anything established.
GHK-Cu topical or injectable for hair?
Topical is the more common and lower-commitment route, and it is closer to how the skin and scalp research was done. We do not give injection protocols for an unproven hair use. If you are considering anything beyond a topical serum, that is a clinician conversation, not something to copy off a forum.
Is it better than minoxidil?
We cannot say it is. Minoxidil has decades of human trials behind it for hair loss; these peptides do not. So no, there is no evidence that GHK-Cu, AHK-Cu, or PTD-DBM beats an established option. People usually explore peptides as an experiment or add-on, not a replacement, and that is a decision to make with a professional.
Which one is cheapest per milligram?
Of the compounds with verified pricing on our data, GHK-Cu is the cheapest at $35/50mg = $0.7/mg (EZ Peptides). AHK-Cu is $42 (Next Gen Peptides), and TB-500 is $42/10mg = $4.2/mg (Next Gen Peptides). We do not have verified pricing for GHK or PTD-DBM yet.
Why do you not sell these?
Because our job is to be on your side, not the vendor's. Clearly Peptides is a price-comparison and lab-data aggregator. We show the lowest verified price per milligram and the certificate of analysis purity, then you buy wherever makes sense for you.