Ingredient or product comparison
GHK-Cu Cycle Protocols: Administration Comparison
4 weeks 1.5–2mg Acute wound healing, post-surgical tissue repair, initial collagen response observation Collagen gene upregulation detectable by week 2; tissue-level changes (wound closure rate, tensile strength) measurable by week 3–4 Optimal for time-sensiti
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- 4 weeks
- 1.5–2mg
- Acute wound healing, post-surgical tissue repair, initial collagen response observation
- Collagen gene upregulation detectable by week 2; tissue-level changes (wound closure rate, tensile strength) measurable by week 3–4
- Optimal for time-sensitive healing studies where endpoints are defined within 30 days. Extend to 6 weeks only if baseline tissue damage is extensive or prior collagen synthesis is impaired.
- 6 weeks
- 2mg
- Scar tissue remodelling, photoaging reversal, dermal thickness improvement
- Dermal collagen density increase measurable by week 4; elasticity and texture improvements apparent by week 5–6
- Standard protocol for aesthetic research applications. Provides full collagen turnover cycle without extending beyond the peptide's effective signalling window.
- 8 weeks
- 2–3mg
- Chronic wound observation, deep dermal restructuring, extracellular matrix remodelling in aged tissue
- MMP downregulation sustained through week 6; maximal collagen fibril organisation by week 7–8
- Reserved for cases where baseline collagen synthesis is severely impaired or tissue requires extended observation. Extending beyond 8 weeks shows minimal additional benefit—GHK-Cu's signalling effect plateaus.
- Split dosing (2× daily)
- 1mg each
- Previously used in early research models before half-life data clarified optimal administration
- No advantage over once-daily 2mg; increases injection burden without improving tissue outcomes
- Obsolete protocol—research from 2015 onward confirms once-daily dosing maintains tissue-level activity for 24 hours. Split dosing adds complexity without benefit.