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Overview
What is AHK-Cu (Copper Tripeptide-3)?
AHK-Cu (Copper Tripeptide-3) is a synthetic copper-binding tripeptide composed of Alanine-Histidine-Lysine complexed with a copper ion (Cu²⁺). While structurally similar to the naturally occurring GHK-Cu (differing only in the first amino acid - alanine vs glycine), AHK-Cu demonstrates targeted activity on dermal papilla cells and hair follicles. Research shows it stimulates hair follicle elongation, promotes dermal papilla cell proliferation, increases VEGF production, and inhibits TGF-β1 - making it particularly promising for hair growth applications. It also supports skin regeneration through fibroblast activation and collagen synthesis.
Key Benefits
Stimulates hair follicle elongation, promotes dermal papilla cell proliferation, increases VEGF for improved scalp circulation, reduces TGF-β1 (counters DHT effects), anti-apoptotic protection for follicles, collagen synthesis support, convenient topical application
Mechanism of Action
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-β1 secretion, and promotes SOD production to reduce oxidative stress. These combined effects support the anagen (growth) phase and may help revive miniaturized follicles.
Molecular Information
Weight
416.9 Da
Length
3 amino acids
Type
Copper tripeptide complex
Amino Acid Sequence:
L-Alanyl-L-Histidyl-L-Lysine (Ala-His-Lys)
* Complexed with divalent copper ion (Cu²⁺). Synthetic analog of GHK-Cu with alanine replacing glycine at N-terminus. Molecular formula: C15H24CuN6O4
Research Indications
Hair Follicle Elongation
Ex vivo studies demonstrate AHK-Cu stimulates human hair follicle elongation at concentrations as low as 10⁻¹² M, promoting longer anagen phase
Dermal Papilla Cell Proliferation
Increases proliferation of dermal papilla cells, the key regulatory cells for hair follicle cycling and hair growth
VEGF Upregulation
Boosts vascular endothelial growth factor production, improving blood flow and nutrient delivery to hair follicles
Anti-DHT Mechanism
Reduces TGF-β1 secretion and oxidative stress (via SOD), both of which contribute to DHT-induced follicle miniaturization
Research Protocols
Disclaimer
These are commonly discussed research protocols and not medical advice. Consult a healthcare provider before use.
Timing
Apply to clean, dry scalp or skin. Evening application is preferred to avoid UV exposure which can degrade the peptide. If using other actives, apply AHK-Cu first and allow to absorb before layering.
Peptide Interactions
How to Reconstitute
Important
Always use bacteriostatic water (BAC). Sterile technique is essential.
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
Store refrigerated at 2-8°C
Use within 30 days of preparation
Quality Indicators
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
- Week 1-2: No visible changes; peptide is working at cellular level
- Week 2-4: Some users report reduced hair shedding; scalp may feel healthier
- Month 1-2: Vellus (fine) hairs may begin appearing in thinning areas
- Month 2-3: New growth becoming visible; existing hairs may appear thicker
- Month 3-4: Noticeable improvement in hair density and quality
- Month 4-6: Significant results visible; continued improvement expected
- Month 6-12: Full results achieved with consistent use
- For skin: Improvements in texture and firmness may be noticed within 4-8 weeks
Side Effects & Safety
- Generally well-tolerated with excellent safety profile in topical applications
- 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
- Store properly - degrades with heat, light, and improper pH
- Patch test before full application if sensitive skin
- Discontinue if irritation, redness, or itching persists
- Not for use on broken or infected skin
- Avoid eye area - may cause irritation
- Limited long-term safety data - use as directed
References
Ionic Liquid Microemulsions for Topical Peptide Delivery
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.
View Study (opens in new tab) →GHK-Cu Regenerative Actions - Gene Expression Data
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.
View Study (opens in new tab) →Human Skin Penetration of Copper Tripeptide In Vitro
Evaluated transdermal delivery of copper tripeptide, demonstrating penetration through skin layers with potential for topical therapeutic applications in skin regeneration and hair growth.
View Study (opens in new tab) →Quick Start Guide
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Community Insights
Self-reported by PepPedia users. Not clinical evidence. Health changes reflect all users, including those taking multiple compounds.
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