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Dihexa vs GHK-Cu

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.
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Dihexa

19 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 2% · Mixed 98% · Unfavorable overall 0%

Most reported benefits

Benefits users selected when logging a favorable or mixed check-in.

Cognition
143

Self-reported dose per injection

Median bucket: 2+ mg · Most common: 2+ mg

Reports span 0 to ≥ 2 mg (open-ended top bucket)

0–0.025 mg
3
2+ mg
140

Anonymized self-reports from PeptIQ users — not prescribing guidance. Buckets group similar logged amounts; open-ended top buckets mean “at least” that dose.

How repeat users are trending

Among repeat reporters, 84% said they felt similar to their last entry, 16% more positive, and 0% more negative.

Overall, repeat reporters leaned more positive than their previous entry.

Median gap between entries: 141 days · Based on 19 repeat reporters

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.

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

Sources (11)

Published sources linked on the Dihexa and GHK-Cu wiki pages.

  1. PubMed

    Dihexa, a small molecule that promotes new synapse formation, demonstrates cognitive enhancement

    McCoy AT, Tan DCS, Tschemernjak A, et al. J Pharmacol Exp Ther. 2013

    Source
    Wiki study page →

  2. PubMed

    Angiotensin IV analog dihexa facilitates learning and memory

    Benoist CC, Kawas LH, Zhu M, et al. J Pharmacol Exp Ther. 2011

    Source
    Wiki study page →

  4. PubMed

    Cognitive benefits of angiotensin IV and angiotensin-(1-7): A systematic review of experimental studies

    Ho JK, Nation DA. Neuroscience and biobehavioral reviews. 2018

    Source
    Wiki study page →

  5. PubMed

    The development of small molecule angiotensin IV analogs to treat Alzheimer's and Parkinson's diseases

    Wright JW, Kawas LH, Harding JW. Progress in neurobiology. 2015

    Source
    Wiki study page →

  6. 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

    Source
    Wiki study page →

  8. PubMed

    GHK peptide as a natural modulator of multiple cellular pathways

    Pickart L, Margolina A. Biomed Res Int. 2014

    Source
    Wiki study page →

  9. ClinicalTrials.gov

    GHK-Cu copper peptide studies on ClinicalTrials.gov

    ClinicalTrials.gov. Clinical trial registry. 2024

    Source
    Wiki study page →

  10. 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

    Source
    Wiki study page →

  11. 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

    Source
    Wiki study page →

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