Ingredient or product comparison
Best Peptides for Thinning Hair: Evidence Comparison
GHK-Cu (copper tripeptide-1) Inhibits 5-alpha-reductase type II; upregulates HGF and VEGF; downregulates TGF-β1 Double-blind RCT (2007): 22% density increase at 24 weeks; multiple replication studies confirm 18–28% range 1–2% w/v topical solution Shedding redu
This source-based comparison does not add ratings or recommend a winner.
- GHK-Cu (copper tripeptide-1)
- Inhibits 5-alpha-reductase type II; upregulates HGF and VEGF; downregulates TGF-β1
- Double-blind RCT (2007): 22% density increase at 24 weeks; multiple replication studies confirm 18–28% range
- 1–2% w/v topical solution
- Shedding reduction 8–12 weeks; density gains visible 16–24 weeks
- Strongest evidence base for androgenetic alopecia—most direct intervention at DHT pathway
- Thymosin beta-4
- Accelerates anagen re-entry; promotes keratinocyte migration during wound repair
- Mouse model (2018): 18% follicle density increase; limited human RCT data available
- 0.1–0.5% subdermal or topical with penetration enhancer
- Faster onset with microneedling (10–14 weeks); slower without (16–20 weeks)
- Promising but under-studied in humans—best used adjunctively with mechanical stimulation
- Matrixyl 3000
- Stimulates collagen I/III/IV synthesis in dermal sheath; restores follicle anchoring
- RCT (2015): 14% increase in hair shaft diameter at 16 weeks; no significant change in follicle count
- 3–5% w/v topical serum
- Diameter increase visible 12–16 weeks; count change minimal
- Most effective for structural thinning in older adults (45+); less effective for pure androgenetic loss
- Palmitoyl pentapeptide-4
- Stimulates laminin-5 and collagen VII expression at dermal-epidermal junction
- In vitro studies only; no human hair-density trials published
- 2–4% w/v in cosmetic formulations
- Unknown—mechanism suggests 16+ weeks if effective
- Insufficient clinical data to recommend as primary intervention