Review Article
GHK-Cu may prevent oxidative stress in skin by regulating copper and modifying expression of numerous antioxidant genes
Pickart L, Margolina A. Cosmetics. 2018
Compare
GHK-Cu vs Kisspeptin
Side-by-side observational reports from PeptIQ users. This compares self-reported patterns — not clinical head-to-head trials.
Last reviewed . By the PeptIQ team.
Observational reporting only — not medical advice. Does not recommend doses, protocols, or treatments.
GHK-Cu
120 community reports
Overall experience
From check-in ratings — separate from side effects logged below. Side effects are logged separately from overall experience. A favorable check-in can still include nausea, fatigue, or injection-site reactions.
Favorable 3% · Mixed 97% · Unfavorable overall 0%
Most reported benefits
Benefits users selected when logging a favorable or mixed check-in.
Mood
226
Recovery
226
Energy
1
Most logged side effects
Side effects are logged separately from overall experience. A favorable check-in can still include nausea, fatigue, or injection-site reactions.
Injection site irritation
222
Self-reported dose per injection
Median bucket: 2–3 mg · Most common: 2–3 mg
Reports span 0 to ≥ 5 mg (open-ended top bucket)
0–0.01 mg
1
0.025–0.05 mg
16
0.2–0.4 mg
4
0.6–1 mg
1
1–2 mg
71
2–3 mg
87
3–5 mg
43
5+ mg
5
Anonymized self-reports from PeptIQ users — not prescribing guidance. Buckets group similar logged amounts; open-ended top buckets mean “at least” that dose.
Commonly stacked with
How repeat users are trending
Among repeat reporters, 89% said they felt similar to their last entry, 11% more positive, and 0% more negative.
Overall, repeat reporters leaned more positive than their previous entry.
Median gap between entries: 46 days · Based on 45 repeat reporters
Kisspeptin
29 community reports
Overall experience
From check-in ratings — separate from side effects logged below. Side effects are logged separately from overall experience. A favorable check-in can still include nausea, fatigue, or injection-site reactions.
Favorable 3% · Mixed 4% · Unfavorable overall 93%
Most reported benefits
Benefits users selected when logging a favorable or mixed check-in.
Libido
150
Self-reported dose per injection
Median bucket: 200–400 mcg · Most common: 200–400 mcg
Reports span 100–1000 mcg
100–200
46
200–400
102
400–600
1
600–1000
1
Anonymized self-reports from PeptIQ users — not prescribing guidance. Buckets group similar logged amounts; open-ended top buckets mean “at least” that dose.
Commonly stacked with
How repeat users are trending
Among repeat reporters, 78% said they felt similar to their last entry, 22% more positive, and 0% more negative.
Overall, repeat reporters leaned more positive than their previous entry.
Median gap between entries: 160 days · Based on 23 repeat reporters
Sources (11)
Published sources linked on the GHK-Cu and Kisspeptin wiki pages.
- Wiki study page →Source
- Wiki study page →Source
PubMed
GHK-Cu in wound healing and tissue regeneration
Pickart L. J Biomater Sci Polym Ed. 2008
- Wiki study page →Source
PubMed
GHK peptide as a natural modulator of multiple cellular pathways
Pickart L, Margolina A. Biomed Res Int. 2014
- Wiki study page →Source
ClinicalTrials.gov
GHK-Cu copper peptide studies on ClinicalTrials.gov
ClinicalTrials.gov. Clinical trial registry. 2024
- Wiki study page →Source
PubMed
GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration
Pickart L, Vasquez-Soltero JM, Margolina A. BioMed research international. 2015
- Wiki study page →Source
PubMed
Biomimetic Hydrogel Scaffolds with Copper Peptide-Functionalized RADA16 Nanofiber Improve Wound Healing in Diabetes
Yang X, Zhang Y, Huang C, et al. Macromolecular bioscience. 2022
- Wiki study page →Source
PubMed
Kisspeptin signaling in reproductive biology
Pinilla L, Aguilar E, Dieguez C, et al. Physiol Rev. 2012
- Wiki study page →Source
PubMed
Kisspeptin in the control of reproduction
Skorupskaite K, George JT, Anderson RA. Fertil Steril. 2018
- Wiki study page →Source
ClinicalTrials.gov
Kisspeptin studies on ClinicalTrials.gov
ClinicalTrials.gov. Clinical trial registry. 2024
- Wiki study page →Source
PubMed
Pubertal development and regulation
Abreu AP, Kaiser UB. The lancet. Diabetes & endocrinology. 2016
- Wiki study page →Source
PubMed
Kisspeptin and fertility
Hameed S, Jayasena CN, Dhillo WS. The Journal of endocrinology. 2011