Best Peptides for Hair Growth
Follicle and copper-peptide claims, and what the trichology literature supports.
How this is graded
Every compound below carries a REGEN research grade, from S (regulatory approval behind the use it is bought for) down to F (no clinical evidence). Ordering follows that grade rather than search volume, so the compound at the top is the one with the most evidence, not the one most often sold. Doses are those reported in published protocols and are not recommendations.
1. GHK-Cu
GHK-Cu is a naturally occurring copper-binding tripeptide whose plasma levels decline with age. It is best known for stimulating collagen and elastin production, improving skin firmness and wound healing, and supporting hair follicle health. It also has antioxidant and anti-inflammatory properties and has been studied for gene-expression effects associated with tissue remodeling. Available both as an injectable for systemic effects and topically for skin and hair. Often part of longevity and aesthetics protocols rather than performance stacks.
- Skin & Aesthetics (grade B) — large observational cosmetic literature; the two controlled trials missed objective endpoints
- Longevity (grade D) — 2026 C. elegans lifespan study, animal-only
- Joint & Tendon Health (grade D) — preclinical only (Fu 2015, rat ACL reconstruction)
Strongest study: Wen C. elegans lifespan, Biogerontology (2026) — mean lifespan extension via mitochondrial + DAF-16/SKN-1 regulation · C. elegans
2. AHK-Cu (Copper Tripeptide-3)
AHK-Cu (copper tripeptide-3) is a copper-binding tripeptide — alanine-histidine-lysine complexed with a copper ion — structurally related to the better-known GHK-Cu but studied with a research emphasis on hair-follicle and dermal-papilla stimulation rather than general skin remodeling. Its regulatory situation has two distinct halves: cosmetic-grade topical AHK-Cu, sold in serums and scalp products, is regulated as a cosmetic ingredient and doesn't require premarket drug approval. Injectable or microneedling-delivered AHK-Cu sold by research-peptide vendors is a separate, unapproved research chemical, not intended for human use.
3. GLOW Blend
GLOW pairs GHK-Cu's skin-remodeling and collagen-stimulating effects with BPC-157 and TB-500's tissue-repair support in a single vial — positioned by vendors as the skin-forward counterpart to the more recovery-focused KLOW blend, which adds KPV for gut/anti-inflammatory coverage that GLOW leaves out in favor of a higher relative GHK-Cu dose.
- Skin & Connective Tissue (grade B) — anchored on GHK-Cu's human cosmetic literature; no trial of the blend itself
At a glance
| Compound | Grade | Reported dose | Half-life |
|---|---|---|---|
| GHK-Cu | Cgrade | 1–2 mg · 1x daily (injectable) | ~1 hour |
| AHK-Cu (Copper Tripeptide-3) | Dgrade | Topical: per-serum concentration · Injectable: no standardized dose · varies by form | — |
| GLOW Blend | Bgrade | ~2.33 mg total blend · daily | — |
Frequently asked questions
Which peptide has the most evidence for hair growth?
GHK-Cu, at research grade C. REGEN Research Tier C — decades of cosmetic human studies and reviews, but no drug approval; objective RCT endpoints have been mixed.
How many compounds are compared here?
3: GHK-Cu, AHK-Cu (Copper Tripeptide-3), GLOW Blend.
What doses are reported for GHK-Cu?
Published protocols report 1–2 mg, 1x daily (injectable). This is what the literature describes, not a recommendation.
References
- GHK peptide as a natural modulator of multiple cellular pathways in skin regeneration · Pickart L, Margolina A · 2018
- Pickart L, Margolina A. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. International Journal of Molecular Sciences. 2018;19(7):1987. · Yang ZX, He XT, Li X, Lian YS, Sun JY · 2018
- Effects of topical copper tripeptide complex on CO2 laser-resurfaced skin. · Miller TR, Wagner JD, Baack BR et al. · 2006
- Pickart L. The human tri-peptide GHK and tissue remodeling. Journal of Biomaterials Science, Polymer Edition. 2008;19(8):969-988. · Taylor TH, Chang CC, Elliott T, Colturato LF, Kort HI, Nagy ZP · 2008
- Tripeptide-copper complex GHK-Cu (II) transiently improved healing outcome in a rat model of ACL reconstruction. · Fu SC, Cheuk YC, Chiu WY et al. · 2015
- The potential of GHK as an anti-aging peptide - PMC - NIH · Dou Y, Lee A, Zhu L, Morton J, Ladiges W · 2020
- Canapp SO Jr, et al. The anti-inflammatory effect of the naturally occurring peptide GHK. Veterinary Surgery. 2003;32(4):391-396. · Russell IF · 2003
- Glycyl-l-histidyl-l-lysine-Cu(2+) rescues cigarette smoking-induced skeletal muscle dysfunction via a sirtuin 1-dependent pathway. · Deng M, Zhang Q, Yan L et al. · 2023
- The human tri-peptide GHK and tissue remodeling · Pickart L · 2008
- Golgi-targeted copper delivery strategy via enhancing copper-dependent proteins' activity for fascia regeneration. · Wang R, Xu Y, Saiding Q et al. · 2026
- The Human Tripeptide GHK-Cu in Prevention of Oxidative Stress and Degenerative Conditions of Aging: Implications for Cognitive Health - PMC · Pickart L, Vasquez-Soltero JM, Margolina A · 2012
- The effect of tripeptide-copper complex on human hair growth in vitro · Pyo HK, Yoo HG, Won CH · 2007