Every peptide sold for hair loss, ranked by its actual evidence.
First, the part nobody selling them will tell you: not one peptide has grown hair in a validated human trial. Not one.
So the top of the board is empty.
S-TIER: empty.
A-TIER: empty.
Below is the unproven, ranked by how close it gets.
B-TIER: GHK-Cu. The best case, and it rests on one confounded, unreplicated human study.
C-TIER: AHK-Cu, human follicles but only in a dish. TB-500 / thymosin beta-4, real stem-cell biology but rodent only. PTD-DBM, regrows hair in mice but Wnt activation = cancer risk.
D-TIER: Capixyl / acetyl tetrapeptide-3, confounded cosmetic trial. Biotinoyl tripeptide-1 / Procapil, manufacturer data only.
F-TIER: BPC-157, Melanotan, PT-141, MOTS-c, CJC-1295, ipamorelin, sermorelin, GHRP-6, tesamorelin, AOD-9604, semax, selank, thymosin alpha-1, KPV, epitalon, SS-31: wrong target, nothing for hair.
Z-TIER: actively makes your hair worse. GLP-1: causes shedding. FOL-005: inhibits human hair.
The hormone actually driving your hair loss is DHT. The proteins downstream are androgen receptor, Wnt, TWTIST1, and more.
We're in a great position to collect more data on the most popular peptides.
If you're currently using a peptide to grow hair, we'd love to give you a free trichoscan ($400 value) to evaluate your progress.