Ingredient or product comparison
GHK-Cu Hair Loss Researchers: Study Design Comparison
Journal of Cosmetic Dermatology (2018) Randomized, vehicle-controlled, N=60 2% topical cream, twice daily 12 weeks Hair density (hairs/cm²) +31.2 hairs/cm² vs +3.1 control p<0.001 Gold-standard design with objective phototrichogram measurements. Results clinic
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- Journal of Cosmetic Dermatology (2018)
- Randomized, vehicle-controlled, N=60
- 2% topical cream, twice daily
- 12 weeks
- Hair density (hairs/cm²)
- +31.2 hairs/cm² vs +3.1 control
- p<0.001
- Gold-standard design with objective phototrichogram measurements. Results clinically meaningful
- International Journal of Molecular Sciences (2019)
- In vitro dermal papilla cell culture
- 1–50 μM in culture medium
- 72 hours
- Cell proliferation (MTT assay)
- 160% increase at 10 μM vs untreated
- p<0.01
- Mechanistic validation showing follicular cell response, but in vitro results don't predict clinical efficacy
- Seoul National University (2020)
- Liposomal stability study
- 1% in liposomes vs aqueous solution
- 6 months storage at 25°C
- Peptide activity retention (HPLC)
- 89% vs 31% remaining activity
- Not applicable (stability study)
- Critical formulation data. Demonstrates why delivery system determines real-world outcomes
- Yonsei University (2021)
- Microneedling + GHK-Cu penetration study
- 2% topical, post-needling vs intact skin
- Single application, 24h measurement
- Dermal peptide concentration (LC-MS)
- 340% increase with microneedling
- p<0.005
- Shows penetration enhancement is real but timing-dependent. Clinical translation requires protocol precision