AHK-Cu (Copper Tripeptide-3)
Hair Growth Copper Peptide | Dermal Papilla Stimulator
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What is AHK-Cu (Copper Tripeptide-3)?
AHK-Cu is a lab-made copper tripeptide — three amino acids bound to a copper ion — closely related to the naturally occurring GHK-Cu, differing by a single amino acid. Researchers have studied it in lab (ex vivo) hair-follicle models for its effects on follicle signaling and in skin-cell studies for collagen-related pathways. It's supplied here strictly as a research compound for laboratory and topical-formulation study, not as a cosmetic or medical product.
Key terms:
AHK-Cu (Copper Tripeptide-3) is a synthetic copper tripeptide complex.
AHK-Cu (Copper Tripeptide-3) is a lab-made peptide of three amino acids — alanine, histidine, and lysine — bound to a copper ion (Cu2+). It is nearly identical to the natural peptide GHK-Cu, differing only in the first amino acid: alanine instead of glycine. In lab studies, AHK-Cu acts on hair follicles and on dermal papilla cells, the cells at the base of each follicle. Researchers reported that it lengthens follicles, increases dermal papilla cell growth, raises VEGF (a signal that grows new blood vessels), and blocks TGF-b1, another signaling protein. That work points to hair-growth applications. Studies also report skin regeneration through fibroblast activation and collagen production.
Key research areas
- Stimulates hair follicle elongation
- Promotes dermal papilla cell proliferation
- Increases VEGF for improved scalp circulation
- Reduces TGF-b1 (counters DHT effects)
- Anti-apoptotic protection for follicles
- Collagen synthesis support
- Convenient topical application
Researched dosing
This table reflects the topical concentrations and application frequencies used in reported formulation research for AHK-Cu, presented as research methodology, not a personal skincare or haircare routine.
| Phase | Dose | Frequency | Route |
|---|---|---|---|
| Hair-growth studies — scalp application | 0.5-1% solution/serum | Once or twice daily | Topical to scalp |
| Hair-growth studies — combined protocol | 0.3-0.5% AHK-Cu with minoxidil | Once or twice daily | Topical to scalp |
| Skin-regeneration studies — face/body | 0.3-1% in serum/cream | Once or twice daily | Topical to skin |
| Compounded research formulations | Add 0.3-1% to water phase | Cool-down phase (<40°C) | Custom formulation |
Commonly cycled 24 weeks on, 0+ weeks off.
How it works
At the cell level, AHK-Cu research looks at how its copper-binding structure signals dermal papilla cells — the cells that regulate hair-follicle growth cycles — and skin fibroblasts involved in collagen production.
AHK-Cu penetrates the scalp to deliver copper directly to dermal papilla cells and hair follicles. It activates proliferation pathways, elevates the Bcl-2/Bax ratio (anti-apoptotic), increases VEGF production for enhanced blood flow, reduces TGF-b1 secretion, and promotes SOD production to reduce oxidative stress. These combined effects support the anagen (growth) phase and may help revive miniaturized follicles.
Molecular data
These figures — molecular weight, three-amino-acid sequence, structure — are the chemistry ID researchers use to confirm an AHK-Cu sample's identity; it's nearly identical in size to GHK-Cu, differing by one amino acid.
- Weight
- 416.9 Da
- Length
- 3 amino acids
- Type
- Copper tripeptide complex
L-Alanyl-L-Histidyl-L-Lysine (Ala-His-Lys)
Research applications
This section lists the research areas — hair-follicle signaling and skin regeneration — that scientists have studied for AHK-Cu, based mostly on lab (ex vivo) and cell-culture models rather than large human trials; it's a summary of the literature, not medical claims about people.
Hair Growth
Ex vivo studies demonstrate AHK-Cu stimulates human hair follicle elongation at concentrations as low as 10^-12 M, promoting longer anagen phase. Increases proliferation of dermal papilla cells, the key regulatory cells for hair follicle cycling and hair growth. Boosts vascular endothelial growth factor production, improving blood flow and nutrient delivery to hair follicles. Reduces TGF-b1 secretion and oxidative stress (via SOD), both of which contribute to DHT-induced follicle miniaturization.
Skin Regeneration
Supports skin regeneration through fibroblast activation and collagen synthesis, improving skin texture and firmness.
Dosage reference
- Doses used in research
- 0.5–1% concentration in topical research formulations.
- Frequency in studies
- Once or twice daily
- Handling
- Reconstituted solution — research use only; not for administration
- Timeline reported in studies
- Week 2-4: Reduced shedding may begin; Month 2-3: New growth visible; Month 4-6: Significant improvement; 6-12 months: Full results
- Storage
- Refrigerate at 2-8°C; protect from light; use reconstituted solutions within 30 days
- Cycle length
- Minimum 12-24 weeks for hair growth assessment; can be used continuously
- Break between cycles
- Not typically cycled; continuous use for best results
Interactions
This list shows which other topical compounds and peptides are studied alongside AHK-Cu, including cautions about combining it with certain copper- or pH-affecting ingredients in a formulation.
Reconstitution & storage
This describes how a research-grade AHK-Cu sample is dissolved into a topical formulation, including the pH range needed to keep the copper-peptide complex stable.
- Calculate amount needed for desired concentration (e.g., 100mg for 1% in 10mL)
- Dissolve AHK-Cu powder in distilled water or water phase of formulation
- Verify pH is between 5.5-7.0 - adjust if necessary (avoid pH below 5)
- Add to cool-down phase of formulation (<40°C / 104°F) - heat degrades peptide
- Mix gently until fully incorporated - do not shake vigorously
- Transfer to dark glass container to protect from light
Lyophilized: Cool, dry place protected from light, use within Per manufacturer expiration date
Reconstituted: 2-6°C, use within 30 days
Quality indicators
These are the visual cues — color, clarity, pH — researchers and formulators check to confirm an AHK-Cu solution hasn't degraded; like other copper peptides, it shows a distinctive light-blue tint when properly prepared.
Light blue powder - AHK-Cu powder should have a characteristic light blue color from the copper complex
99%+ purity with COA - Pharmaceutical/cosmetic grade with certificate of analysis confirming identity and purity
Proper copper complexation - Should dissolve to clear light blue solution; cloudiness indicates quality issues
pH-stable formulation - Final product pH between 5.5-7.0 for optimal stability and skin compatibility
Liposomal preferred for penetration - Liposomal delivery systems improve AHK-Cu stability and skin/scalp penetration
Discolored or degraded appearance - Brown, green, or colorless solutions indicate degradation - do not use
pH below 5.0 - Acidic conditions destabilize copper peptide complex - verify pH before use
What to expect
This timeline reflects what the published research literature reports at each study stage for topical AHK-Cu — research context for comparing studies, not a personal-results promise.
No visible changes; peptide is working at cellular level
Some users report reduced hair shedding; scalp may feel healthier
Vellus (fine) hairs may begin appearing in thinning areas
New growth becoming visible; existing hairs may appear thicker
Noticeable improvement in hair density and quality
Significant results visible; continued improvement expected
Full results achieved with consistent use. For skin: Improvements in texture and firmness may be noticed within 4-8 weeks
Safety notes
This section covers handling cautions and regulatory notes for AHK-Cu — it is not FDA-approved, and most available data comes from lab and cell-based studies rather than human clinical trials.
- Avoid use with acidic products (AHAs, BHAs, Vitamin C) - use at different times
- Do not combine with additional copper supplements - risk of copper toxicity
- Keep pH between 5.5-7.0 for stability and skin compatibility
- Patch test before full application if sensitive skin
- Not for use on broken or infected skin
- Avoid eye area - may cause irritation
- Limited long-term safety data - use as directed
Regulatory status
- Not approved by the FDA for any indication.
- Supplied and described for laboratory research use only — not for human or veterinary use.
Community data
Community Insights
Based on data the community reported. Not clinical proof.
References
Novel delivery system using thermodynamically stable ionic liquid microemulsions to improve topical delivery and stability of copper tripeptides including AHK-Cu for enhanced therapeutic effects.
While focused on GHK-Cu, this landmark review establishes the broader mechanisms of copper tripeptides in tissue regeneration, collagen synthesis, and anti-inflammatory pathways relevant to AHK-Cu.
Evaluated transdermal delivery of copper tripeptide, demonstrating penetration through skin layers with potential for topical therapeutic applications in skin regeneration and hair growth.